Baked Lemon Slice | Classic Recipe (2024)

Published: by Lucy · This post may contain affiliate links · 50 Comments

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The easiest and most delicious Baked Lemon Slice recipe with a creamy and tangy lemon frosting. A classic slice that's ready to eat in less than 1 hour and is perfect for morning tea or school lunchboxes.

Baked Lemon Slice | Classic Recipe (1)

When you feel like baking a classic, comforting slice then my baked lemon slice is exactly what you need.

Simple to prepare, the light and fluffy cake-like base is perfectly complemented by the smooth and creamy lemon frosting.

Just like my Easy Chocolate Coconut Slice, Passionfruit Slice, Jelly Slice and Mars Bar Slice, this recipe takes just a few minutes to prepare and is as popular today as it was 50 years ago!

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Why You're Going To Love This Recipe

If you've been visiting my blog for a while then you'll know that my key principle is to make delicious food without any fuss.

If it's easy to make, quick, and tastes fabulous - then I'm all in!

And this Baked Lemon Slice recipe is all those things... plus so much more.

  • Basic pantry & fridge staples - I wouldn't be surprised if you find that you have all the ingredients on hand already. Made from basic pantry and fridge staples, this is a great recipe to whip up when you want to avoid an extra trip to the supermarket.
  • Time saver - just mix the ingredients together in one bowl and then bake - all in just 30 minutes. Wait for the slice to cool and then smother it in luscious creamy frosting.
  • Most popular recipe - this is the perfect recipe to enjoy with friends over a coffee. A beautiful freshly baked, moist and tangy lemon slice is always popular.
  • Freezer friendly - yes, you can freeze this slice too! Perfect for 'grab and go' lunchbox fillers.
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What You Need

There's absolutely no fancy ingredients required for this simple baked lemon slice.

Note: Please scroll to the recipe card at the bottom of the post for ingredient quantities and the full detailed method.

For The Base

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  • Butter - either salted or unsalted butter can be used in this recipe.
  • Caster sugar - I recommend using caster sugar rather than regular granulated white sugar as it dissolves easier when creamed with butter making it the perfect sugar for cakes, cupcakes, slices and desserts.
  • Lemon zest - from one lemon. See how to zest a lemon here.
  • Eggs - at room temperature.
  • Lemon juice - from one lemon, or alternatively use store bought lemon juice.
  • Baking powder
  • Plain flour - also known as all-purpose flour.

For The Lemon Frosting

Baked Lemon Slice | Classic Recipe (5)
  • Icing sugar - use pure icing sugar as it will set the frosting firmer than icing sugar mixture.
  • Butter - either salted or unsalted butter can be used in this recipe.
  • Lemon juice - it is preferable to use fresh lemon juice, but if fresh lemons aren't available then store bought lemon juice makes a great substitute.

Step By Step Instructions

This is just the easiest 4-step baked lemon slice recipe!

Note: Please scroll to the recipe card at the bottom of the post for ingredient quantities and the full detailed method.

Step 1 - Beat

Preheat your oven to 170 degrees celsius (fan forced), and grease and line a square baking tin.

Place butter (that has been softened to room temperature), caster sugar and lemon zest into a large bowl.

Beat the ingredients together until smooth and creamy.

Step 2 - Add Wet Ingredients

Add the eggs and lemon juice and beat well to combine.

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Step 3 - Add Dry Ingredients

Fold through the baking powder and flour.

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Mix together gently until well combined.

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Pour the mixture into your prepared baking tin and place into the oven to bake.

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Step 4 - Make The Frosting

Prepare the lemon frosting by sifting the icing sugar into a bowl and then adding the softened butter and lemon juice.

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Whisk until the icing is completely smooth.

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Once the baked slice base has cooled completely, spread the icing evenly over the slice whilst it is still in the baking tin.

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Once the icing has set, remove the slice from the tin to cut and serve.

Tips For Making The Best Lemon Frosting

Follow these tips for a beautiful creamy lemon frosting:

  • Use pure icing sugar(as compared to icing sugar mixture) as it will set the frosting firmer than icing sugar mixture. A firmer icing is best when sending the slice in school lunch boxes.
  • Sift the icing sugarbefore using to remove any lumps (pure icing sugar tends to have more lumps than the softer icing sugar mixture so don't miss this step!)
  • Useroom temperature butter.
  • If yourfrosting is too thickto spread,add a small amount of extra lemon juiceand mix again.
  • If yourfrosting is too thin, add someextra sifted icing sugar.
  • Whisk the frosting until it's smooth and creamywith no lumps of butter or icing sugar remaining.
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Expert Tips & FAQ's

How do I adjust the temperature for my conventional oven?

Temperatures given in my recipes are for fan-forced ovens. All ovens are slightly different but to bake in a conventional oven, simply increase the temperature by 10-20 degrees, and keep a close eye towards the end of the baking time to ensure the slice isn't browning too quickly.

What happens if my frosting is either too runny or too thick?

This can easily be fixed by adding extra icing sugar (if too thin) or extra lemon juice (if too thick). See my tips above for making the perfect lemon frosting.

Storing & Freezing

You can store this baked lemon slice in an airtight container atroom temperature for up to 5 days, or freeze for up to 1 month.
I recommend keeping this baked lemon slice at room temperature so that it stays beautifully soft and moist.

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This Baked Lemon Slice is just so deliciously tangy and moist - the perfect afternoon tea recipe!

If you find that you have a fruit bowl overflowing with lemons, these lemon recipes are always popular:

  • Gluten Free Lemon Cake
  • Creamy Mini Lemon Puddings
  • No Bake Lemon Cheesecake

WANT EVEN MORE DELICIOUS RECIPES?Subscribe to my newsletteror follow along onFacebookorInstagram. And if you love baking, then please come and join myFacebook cooking club grouporsubscribe to my YouTube channel.

Baked Lemon Slice | Classic Recipe (20)

Baked Lemon Slice

The easiest and most delicious Baked Lemon Slice.... with the BEST creamy & tangy lemon frosting - this is such a quick, simple and classic slice recipe.

5 from 89 votes

Print Pin Rate

Course: Slices

Cuisine: Baking

Prep Time: 10 minutes minutes

Cook Time: 20 minutes minutes

Total Time: 30 minutes minutes

Servings: 16 pieces

Calories: 238kcal

Author: Lucy - Bake Play Smile

Ingredients

  • 115 g butter softened to room temperature
  • 150 g (¾ cup) caster sugar
  • lemon zest from 1 lemon
  • 2 eggs room temperature
  • lemon juice from 1 lemon
  • ½ tsp baking powder
  • 95 g (¾ cup) plain flour

For the frosting

  • 270 g (1 ¾ cup) pure icing sugar sifted, see notes
  • 65 g butter softened to room temperature
  • 4 tbs lemon juice (extra if needed)

Instructions

Conventional Method

  • Preheat oven to 170 degrees celsius (fan-forced). Grease and line a 20cm x 20cm cake tin with baking paper. Set aside.

  • Place the butter, caster sugar and lemon zest into a large bowl. Beat until smooth and creamy.

  • Add the eggs and lemon juice and beat to combine.

  • Fold through the baking powder and flour.

  • Spoon the mixture into the prepared tin and bake for 20-25 minutes or until a skewer inserted into the middle comes out clean.

  • To prepare the frosting, place the sifted icing sugar, butter and lemon juice into a bowl. Whisk until smooth and creamy. If the frosting is a little too thick, add a bit more lemon juice and whisk again. If too thin, add a little more icing sugar.

  • Spread the frosting over the cooled slice and allow to set.

Thermomix Method

  • Preheat oven to 170 degrees celsius (fan-forced). Grease and line a 20cm x 20cm cake tin with baking paper. Set aside.

  • Place the butter, caster sugar and lemon zest into the Thermomix bowl. Insert the butterfly and mix for 30 seconds, Speed 4. Scrape down the sides of the bowl and repeat until smooth and creamy.

  • Add the eggs and lemon juice and mix for 10 seconds, Speed 4, to combine.Remove the butterfly.

  • Add the baking powder and flour and mix for 10 seconds, Speed 4. Scrape down the sides and repeat for a further 5 seconds.

  • Spoon the mixture into the prepared tin and bake for 20-25 minutes or until a skewer inserted into the middle comes out clean.

  • To prepare the frosting, place the icing sugar, butter and lemon juice into the Thermomix bowl and mix for 20 seconds on Speed 4. Scrape down the sides of the bowl with a spatula. Mix for an extra 30 seconds, Speed 4.

  • If the frosting is a little too thick, add a bit more lemon juice and whisk again. If too thin, add a little more icing sugar.

  • Spread the frosting over the cooled slice and allow to set.

Notes

RECIPE NOTES & TIPS

  • Use pure icing sugar (as compared to icing sugar mixture) as it will set the frosting firmer than icing sugar mixture. A firmer icing is best when sending the slice in school lunch boxes.
  • If your frosting is too thickto spread,add a small amount of extra lemon juice and mix again.
  • If yourfrosting is too thin, add someextra sifted icing sugar.
  • Storing & Freezing - store this slice in an airtight container for up to 5 days, or wrap well and freeze for up to 1 month. Allow to thaw before consuming.

Nutrition

Calories: 238kcal | Carbohydrates: 37g | Protein: 2g | Fat: 10g | Saturated Fat: 6g | Cholesterol: 45mg | Sodium: 89mg | Potassium: 39mg | Fiber: 1g | Sugar: 28g | Vitamin A: 310IU | Vitamin C: 1.5mg | Calcium: 14mg | Iron: 0.6mg

Did you try this recipe?Mention @BakePlaySmileBlog or tag #BakePlaySmile!

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Reader Interactions

Comments

  1. Elizabeth Lee

    Baked Lemon Slice | Classic Recipe (21)
    Super easy, and so delicious! It tastes like it took hours to make, yet it’s so easy and simple! Great recipe.
    Thanks

    Reply

    • Lucy

      Fantastic!

      Reply

  2. Julie

    Great easy no fuss lemony treat

    Reply

  3. Liz

    Baked Lemon Slice | Classic Recipe (22)
    Thanks for the great recipe - it was quicker & easier than I was expecting and everyone loves it!

    Reply

    • Lucy

      I'm so happy to hear that!

      Reply

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Baked Lemon Slice | Classic Recipe (2024)

FAQs

What does lemon do in baking? ›

To balance flavors: Lemon juice can play a great balancing role in baked goods. We sometimes use it in our cookies to balance out a sweet flavor profile. For instance, our CAVA Apricot Cookies contain a small amount of lemon juice to balance the sweetness of the honey-flavored cookie dough.

What ingredients are in lemon juice? ›

Lemon juice is deceptively simple in composition, comprising water, sugars, organic acids (principally citric acid) and small amounts of amino acids, vitamins and phenolic compounds. Sundry plant compounds that provide various health benefits include citric acid, hesperidin, diosmin, eriocitrin, and d-limonene.

How do you cut the taste of lemon? ›

One of the easiest ways to cut the lemon taste is to balance it with sweetness. Adding a touch of sugar or sweetener can help neutralize the acidity and bring out the natural flavors of lemon. You can try adding a teaspoon of honey, agave syrup, or a sprinkle of powdered sugar to your lemon-infused dishes or drinks.

Which lemon is best for baking? ›

Because of this, Meyer lemons are perfect for baked goods and savory recipes that could use some brightening.

How long to leave lemon in oven? ›

While the oven works to reach the desired temperature, fill an oven-safe bowl with tap water. Chop one lemon into thirds and squeeze the juice into the water mixture, placing the lemon pieces directly into the bowl afterwards. Place the bowl on the oven rack and let the concoction bake for 30 minutes.

Is eating whole lemons good for you? ›

Promote Digestive Health

This is stellar news if you're prone to constipation, but keep in mind that this gut-friendly nutrient is found in the pulp, rather than the juice itself. Meaning, you have to eat the whole lemon — almost as if you'd eat an orange — to really reap the gut-helping nutrients in the pulp.

Is bottled lemon juice the same as real lemon? ›

However, if you've ever tasted bottled lemon juice, you'll notice that the flavour is a little off – not bright and lemony like the real stuff. This is because bottled lemon juice usually contains additives and preservatives such as Sodium Metabisulphite (E223) or Potassium Metabisulphite (E224).

Can I use bottled lemon juice instead of fresh for baking? ›

To use: Shake well before use, and use the same amount of bottled lemon juice in a recipe as you would fresh juice. If a recipe specifies the juice of 1 lemon, replace it with 2 tablespoons of bottled lemon juice.

Does lemon get bitter when cooked? ›

The last bit of advice with cooking with lemon is true for both zest and juice. Don't add it too early to a dish — when it's still cooking and very hot. When introduced to too much heat for too long, lemon can easily turn bitter and even discolor other ingredients being cooked with it.

Which part of lemon is bitter? ›

As with all citrus fruits, the pith is one of the bane of annoyance. It is the bitter part that makes eating citrus fruits troublesome because of the need to scrape it off.

Why are my lemons so bitter? ›

Bitterness is mainly caused by the accumulation of two different chemical compounds: limonin from the limonoid terpine group and naringin from the flavonoid phenolic group in the fruit tissues. The highest concentrations of the bitter compounds are generally found in immature fruits.

What happens when lemon juice is mixed with baking? ›

When baking powder is mixed with lemon juice, bubbles formed because of evolution of carbon dioxide gas. This is a chemical change, because in this reaction new substances are formed.

What happens when you add lemon to your food? ›

Consuming lemon with food can offer several health benefits. Lemons are a good source of vitamin C, which helps boost your immune system and supports healthy skin. The citric acid in lemons may aid in digestion by promoting the production of digestive enzymes.

What happens when you add lemon while cooking? ›

You can add lemon or lime juice while food is cooking, and it will mellow out as it cooks. Using some fresh juice to boost the flavor adds a bright hit of acid that wakes up your taste buds. You can do this with herbs too.

Does lemon enhance flavor? ›

Lemon has the power to lift all the flavors in a dish. As an acidic ingredient, it brings flavors to life—through tangy contrast, it highlights the sweet, salty or savory elements in a dish. So when you add lemon, you aren't just adding lemon flavor, you're developing flavor in the entire dish.

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