Easy Cheesy Brussels Sprouts Au Gratin - CopyKat Recipes (2024)

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by Stephanie Manley, Last Updated 5 Comments

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Brussels Sprouts Au Gratin is a new way you can prepare Brussels sprouts. Fresh Brussels sprouts are baked in a creamy cheese sauce with crispy bacon.

Easy Cheesy Brussels Sprouts Au Gratin - CopyKat Recipes (1)

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What Makes Brussels Sprouts Au Gratin a Side Dish That Needs To Be On Your Table

Sure, go ahead and make jokes about brussels sprouts. Turn your nose up at them if you wish, but you’ll miss out on one of the most delicious and versatile side dishes you can make.

If you are not already a fan of this much-maligned vegetable, then this Brussels Sprouts Au Gratin recipe is likely to change your mind. Not only is it deliciously hot and creamy, but it is also pretty nutritious!

What Makes This Recipe So Good?

Everything is better with bacon! Adding bacon to this dish delivers a subtle smoky taste that perfectly complements the earthy flavors in the brussels sprouts.

When combined with the slight nuttiness of a young gruyère cheese and the creaminess of the bechamel sauce, you wind up with a very special au gratin.

Ingredients For Au Gratin Brussels Sprouts

To prepare this dish, you’ll need:

  • Fresh brussels sprouts
  • Butter
  • All-purpose flour
  • Whole milk
  • Salt
  • Ground black pepper
  • Gruyere cheese
  • Bacon, cooked

Use a young gruyere in this recipe since less-aged gruyeres have a creamier texture and a slightly nutty flavor profile. Older gruyeres tend to have more earthy notes.

For the smoothest and creamiest sauce, it is best to grate the cheese yourself using a fine-hole grater. Manufacturers usually use an anti-caking additive to keep their pre-shredded cheeses from clumping. This additive also prevents the cheese from melting easily, which can be problematic in this recipe.

Easy Cheesy Brussels Sprouts Au Gratin - CopyKat Recipes (2)

How To Make This Brussels Sprouts Casserole

To prepare the creamiest, crunchiest brussels sprouts that you have ever had:

  1. Preheat the oven to 350°F.
  2. Rough chop the cooked bacon.
  3. Remove any withered or discolored outer leaves from the brussels sprouts and rinse them well. Pat the brussels sprouts dry with a kitchen towel.
  4. Trim off the tough stem but don’t remove so much that the leaves start to separate.
  5. Cut the brussels sprouts in half longways.
  6. Dump the prepped brussels sprouts into a9×13 casserole dishand shake them into a single layer. Set aside for later.
  7. Melt the butter in a saucepan over medium heat.
  8. Sprinkle the flour into the pan while whisking well. Continue to whisk and let the butter and flour mixture cook for about a minute until it is a light tan and smells like baked pie dough.
  9. Slowly pour in the milk and stir until the sauce thickens slightly.
  10. Season with salt and fresh pepper.
  11. Stir in the cheese in batches until it melts and the sauce is smooth.
Easy Cheesy Brussels Sprouts Au Gratin - CopyKat Recipes (3)
  1. Pour the cheese sauce over the brussels sprouts in the casserole dish.
  2. Sprinkle the bacon on top.
  3. Put the dish in the oven and bake for 45 minutes, rotating the pan halfway through to ensure even cooking.
  4. Remove the casserole from the oven and allow it to cool slightly before serving.
Easy Cheesy Brussels Sprouts Au Gratin - CopyKat Recipes (4)

Brussels Sprouts Au Gratin Recipe Variations

Feel free to customize this recipe depending on your tastes and what ingredients you have available. Here are a few suggestions you may want to try:

  • Replacing gruyere with gouda for an extra boost of smokiness in the dish.
  • Add a couple of tablespoons of parmesan cheese to the sauce.
  • Sauteing a couple of tablespoons of minced shallots in the butter before adding the flour to add a new layer of flavor.
  • Substituting cooked sausage or pancetta for the bacon.
Easy Cheesy Brussels Sprouts Au Gratin - CopyKat Recipes (5)

What To Serve With Brussels Sprout Casserole

This is a wonderful side for any roasted meat or poultry dish. Serve it with steak or even as an appetizer with plenty of toasted bread.

How To Store the Leftovers

Let any extra au gratin brussels sprouts cool to room temperature before storing them in an airtight container for up five days in the refrigerator. While you can freeze leftovers, since this dish contains a dairy-based sauce, it may separate slightly once reheated.

What’s the Best Way to Reheat Brussels Sprout Casserole

To reheat thawed brussels sprouts gratin:

  1. Preheat the oven to 350°F.
  2. Set the Brussels Sprouts Au Gratin on the counter for at least ten minutes to eliminate some of the chill from the fridge.
  3. Cut the casserole into portions and place them in a clean baking dish.
  4. Cover the baking dish with aluminum foil and bake for about 25 minutes or until the casserole is warmed through.
Easy Cheesy Brussels Sprouts Au Gratin - CopyKat Recipes (6)

Love Easy Oven Baked Side Dishes? Check Out These Recipes

  • Baked Beans with Bacon
  • Baked Potato Casserole
  • Baked Red Potatoes Recipe
  • Cheddar Cauliflower Recipe
  • Creamed Corn Au Gratin
  • Green Beans Gratin
  • Keto Cauliflower Bake
  • Keto Cheesy Broccoli
  • Potatoes and Leeks Recipe
  • Sweet Potatoes with Candied Pecans

More Brussels Sprouts Recipes

  • Air Fryer Brussel Sprouts with Balsamic Glaze
  • Crispy Brussel Sprouts with Bacon
  • Roasted Brussel Sprouts

Be sure to look at more delicious side dishes recipes and cooking on a budget.

Brussels Sprouts Au Gratin

Brussels Sprouts Au Gratin is easy to make and reheats so well.

5 from 2 votes

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Course: Side Dish

Cuisine: American

Keyword: Brussels Sprout Au Gratin

Prep Time: 15 minutes minutes

Cook Time: 45 minutes minutes

Total Time: 1 hour hour

Servings: 8

Calories: 218kcal

Ingredients

  • 2 pounds fresh Brussels sprouts washed, trimmed, and halved
  • 3 tablespoons butter
  • 3 tablespoons all-purpose flour
  • 2 1/2 cups whole milk
  • 1/2 teaspoon salt
  • 1/2 teaspoon ground black pepper
  • 1 cup shredded Gruyère cheese
  • 1/2 cup diced bacon cooked until crisp

Instructions

  • Preheat the oven to 350°F.

  • Place the Brussels sprouts into a 9×13-inch baking dish.

  • Melt the butter in a medium saucepan over medium heat. Add the flour. Whisk and continue to cook for about 1 minute. The butter and flour mixture will become fragrant like pie dough.

  • Slowly add the milk and continue to whisk. When all the milk has been incorporated, cook until the sauce thickens, stirring constantly. Season with salt and pepper.

  • Slowly add the cheese and stir to incorporate. Cook until the cheese has fully melted.

  • Pour the cheese sauce over the Brussels sprouts, sprinkle the bacon on top, and bake in the preheated oven for about 45 minutes.

Nutrition

Calories: 218kcal | Carbohydrates: 16g | Protein: 11g | Fat: 13g | Saturated Fat: 7g | Cholesterol: 38mg | Sodium: 311mg | Potassium: 555mg | Fiber: 4g | Sugar: 6g | Vitamin A: 1265IU | Vitamin C: 96.4mg | Calcium: 302mg | Iron: 1.8mg

About Stephanie Manley

I recreate your favorite restaurant recipes, so you can prepare these dishes at home. I help you cook dinner, and serve up dishes you know your family will love. You can find most of the ingredients for all of the recipes in your local grocery store.

Stephanie is the author of CopyKat.com's Dining Out in the Home, and CopyKat.com's Dining Out in the Home 2.

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Reader Interactions

Comments

  1. Deborah

    Easy Cheesy Brussels Sprouts Au Gratin - CopyKat Recipes (8)
    Thanks for a delicious recipe. MY First time using gruyere cheese. Very flavorful, rich and creamy sauce. I needed to make a quick supper so I added shrimp. Cooking time was perfect. Sauce could be used for many recipes.

    Reply

  2. Michael Langevin

    Easy Cheesy Brussels Sprouts Au Gratin - CopyKat Recipes (9)
    Very good recipe. Used a different white creamycheese and added garlic.
    Can not imagine somebody thinking one could “slide” sprouts in half and could not figure it was a typo. Love sprouts and now bake them in my penne cream bake along with zucchini and what ever meat in the fridge.

    Reply

    • Stephanie Rife

      What type of cheese did you use? I was going to use mozzeralla…

      Reply

      • Stephanie

        I used Gruyere, it is “swiss” cheese.

Leave a Reply

Easy Cheesy Brussels Sprouts Au Gratin - CopyKat Recipes (2024)

FAQs

Why do you soak Brussels sprouts before cooking? ›

Not only can soaking make the centers more malleable, but the water that's absorbed into them will create a steaming action, whether you choose to roast, saute, or make your Brussels sprouts in your air fryer. The steam can help to ensure the cooking is even throughout the Brussels sprout.

Do you need to blanch brussel sprouts before baking? ›

Like all cabbages, Brussels are unavoidably fibrous and dense. You must overcome this by either cooking them in salty water until fork tender (blanching), or by roasting at a high (over 425F) temperature for upwards of 20 minutes. To guarantee great texture, do both!

Why won't my brussel sprouts get crispy? ›

Roast the Brussels Sprouts at high heat

If you don't hear them crisping up in the oven, add a little more oil and roast them for a few more minutes until your desire crispiness is achieved!

Why are my brussel sprouts soggy in the oven? ›

Not using enough oil.

The other secret to ridiculously crispy Brussels sprouts is tossing them in plenty of oil. We like to use olive oil, but plain vegetable oil is great too. If the sprouts are well-coated, they'll caramelize and char instead of simply softening in the oven.

Should you cut Brussels sprouts in half before cooking? ›

Step right up, we've got all the secrets. To create a crunchy exterior and allow water to escape from the brussels, they should be cut in half before roasting (and sometimes, if large, into quarters as well). Additionally, time and temperature are two important factors when roasting brussel sprouts.

How long should you soak Brussels sprouts in salt water? ›

Contributed by Whole Foods Market, Inc. To prepare, soak Brussels sprouts in a bowl of cold, salted water for 20 minutes. Preheat oven to 400°F.

Is it better to parboil Brussels sprouts before roasting? ›

Unlike other vegetables, Brussels sprouts can be parboiled (even a day ahead) to reduce the roasting time without hurting their texture. That means the sprouts can be popped in the oven while the meat is resting before carving. Of course, if the main course is grilled or pan-cooked, the oven will be free for roasting.

Are Brussels sprouts better steamed or boiled? ›

Steaming Brussels sprouts preserves more of the nutrients and antioxidants than any other cooking method. And they turn out tasting like crisp-tender, sweet little nuggets. Plus they're just about the quickest veggie side dish you can cook.

What happens if you don t blanch brussel sprouts before freezing? ›

Can you freeze raw Brussels sprouts without blanching? You can you freeze uncooked Brussels sprouts, but you'll need to be aware that they may be a little softer than if you blanched them (so keep an eye on the cooking time). Plus, they won't keep in the freezer for as long.

Why do brussel sprouts taste bad sometimes? ›

The bitter taste of Brussels sprouts comes from compounds called glucosinolates and their degradation products, he explains. These bitter tasting compounds are an important part of the plant's defence mechanism against leaf-eating enemies, such as insects, nematodes, slugs, and herbivores, like pigeons and deer.

Should you wash Brussels sprouts before roasting? ›

To prepare brussel sprouts, you should rinse them well or even soak them if you have enough time. Trim the bottoms and outer leaves off, then cut them in half to prep them for roasting.

What season is best for brussel sprouts? ›

A slow-growing, long-bearing crop, Brussels sprouts should be planted in early spring, or mid- to late summer for a crop that matures in the fall. The small heads mature best in cool and even in light frosty weather. Spring planting is also fine in cooler climates.

How do you keep Brussels sprouts from drying out in the oven? ›

Like soggy steamed Brussels, Brussels sprouts that are dry and chewy are no good either. This could be caused by using too little oil for roasting. You need a nice coating of oil—enough to make the heads shiny or if they're cut, enough oil to get inside the folds of some of the leaves.

Why do brussel sprouts smell bad when cooking? ›

Yes, according to the Los Angeles Times, Brussels sprouts inherited another gene that causes them to stink up your kitchen when you cook them. When you cook Brussels sprouts they give off a gas: hydrogen sulfide. And if you are the least bit sensitive to smells, it will make you want to hurl.

Can you eat overcooked Brussels sprouts? ›

For best results, cook sprouts until just tender, never mushy. Overcooking produces the offensive odor associated with Brussels sprouts. It's caused by the release of sulfur-containing compounds. Overcooking also causes them to turn a drab olive green.

How many hours sprouts should be soaked? ›

The norm is 8-12 hours, but some soak for only 20 minutes, some occasionally soak in warm or hot water and for more or less time - Check the seed information pages for the seeds you are sprouting. Skim off any non-seeds that are floating on the water*.

How do you get the bitterness out of Brussels sprouts? ›

A splash of lemon juice, or even apple cider vinegar, works wonders on bitter sprouts. Another key ingredient is fat, which helps Brussels sprouts to crisp up. This is why it's so popular to render bacon fat and cook Brussels sprouts in it, then add the bacon bits back in at the end.

How do you get bugs out of Brussels sprouts before cooking? ›

Brussels Sprouts

Get them ready for your plate by placing the sprouts in a bowl filled with warm water and let them soak for about 10 minutes — this will flush out the dirt and any lurking pests.

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