Brussels Sprouts Gratin

Cheesy Brussels Sprouts Gratin is a simple side dish recipe that is loaded with flavor. It’s made with a creamy Parmesan and Gruyere cheese sauce with a crispy breadcrumb topping. It’s a delicious option to serve with many main dishes or for holiday dinners.

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Clik here to view. A small, white plate of brussels sprouts gratin with a fork on it and a white casserole dish and glass of water partially showing in the background.

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Brussels sprouts are definitely a love ’em or hate ’em kind of vegetable. If you’re in the “love ’em” category, you probably really love them and ended up on this recipe looking for a new way to enjoy them.

This recipe is a cheesy, delicious way to prepare Brussels sprouts that might even convert a hater into a lover. Cheese kinda has a way of doing that, doesn’t it?

Why This Recipe Works

This is an easy recipe to make and can be served alongside most main dishes.

Brussels sprouts are covered in a rich, creamy, cheesy sauce that even kids will enjoy.

You can use this recipe as a base and modify it however you’d like. Different vegetables or types of cheeses can easily be swapped in and out. Gratins can also be topped with foods other than breadcrumbs, like extra cheese.

Step-By-Step Instructions

Ingredients

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Clik here to view. Ingredients needed to make brussels sprouts gratin on a light surface with text overlay.

2 tablespoons butter (divided)
2 pounds Brussels sprouts (trimmed and cut in halves)
salt
pepper
1 shallot (about 1/4 cup diced)
2 cloves garlic (minced)
1 cup heavy cream
1/2 cup Parmesan cheese (shredded)
1/2 cup Gruyere cheese (shredded, divided)
1/4 cup breadcrumbs

The entire recipe and instructions can also be found in the recipe card at the bottom of this post. You can print the recipe from the card, if needed.

Prep!

Trim the stems of the Brussels sprouts and cut each one in half length-wise.

Dice the shallot, mince the garlic, and shred the cheeses.

Grease a medium size casserole dish using a small amount of butter or non-stick cooking spray.

Preheat your oven to 400°F.

Create!

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Clik here to view. A black skillet filled with cooked brussels sprouts.

Heat 1 tablespoon of the butter in a large skillet over medium heat. Add the Brussels sprouts and season with salt and pepper.

Cook until just starting to brown and soften, about 7-9 minutes. Place in the prepared casserole dish.

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Clik here to view. Garlic and shallots cooking in a black skillet.

Return the pan to the stove and add the remaining tablespoon of butter.

Add the shallots and garlic and cook for about 2-3 minutes until just softened.

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Clik here to view. A cream-based sauce in a black skillet.

Add the heavy cream and cook for an additional 1-2 minutes until hot and bubbly.

Remove from the heat and stir in the Parmesan cheese and half of the Gruyere cheese until melted. The sauce will be creamy and thick.

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Clik here to view. Brussels sprouts gratin prior to baking in a square, white casserole dish.

Pour over the Brussels sprouts and toss to coat.

Top with the breadcrumbs and remaining Gruyere cheese.

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Clik here to view. A baked brussels sprouts gratin in a white casserole dish.

Bake, uncovered, for about 15 minutes or until the cheese is bubbling and the top is just starting to brown.

You can put the casserole under the broiler for a couple minutes to brown the top more. Be sure to keep a close eye on it as it can burn quickly.

Present!

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Clik here to view. A partial view of a white casserole dish with brussels sprouts gratin with a spoon in it.

Serve hot.

Alternative Gratin Toppings

Use only the Gruyere cheese.
Make an almond flour breadcrumb topping (see this recipe for Keto Broccoli Casserole for the instructions).
Use crushed pork rinds (if you’re into that kind of thing).
Try chopped nuts (pistachios work great!)

How to Store Leftover Brussels Sprouts Gratin

Store leftovers in an airtight container in the refrigerator. Consume within 3 days.

More Brussels Sprouts Recipes

Maple Roasted Brussels Sprouts and Carrots

This recipe for a sweet and savory vegetable medley uses Brussels sprouts, carrots, maple syrup and a couple basic seasonings to create a flavorful side dish. Maple Roasted Brussels Sprouts and Carrots are easy to prepare, deliciously sweet and savory flavored, and a healthy complimentary side dish to serve alongside a variety of main courses.

Get The Recipe

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Clik here to view. Roasted brussels sprouts and carrots with a wood turner on a baking sheet

Brussels Sprouts with Bacon

An easy side dish, which is incredibly flavorful and savory thanks to simply pan-frying Brussels Sprouts in rendered bacon fat. Bacon Brussels Sprouts are smokey, salty, and a comforting side dish to serve during cooler months.

Get The Recipe

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Clik here to view. Brussels sprouts with bacon in a cast iron skillet on a marble backdrop

Brussels Sprouts with Bacon, Cranberries, and Apples

Bacon Cranberry Brussels Sprouts with apples combines savory Brussels sprouts and bacon, tart cranberries and apples with sweet maple syrup. It's an easy side dish recipe to prepare and sure to convert anyone who thinks they don't like this vegetable into a fan!

Get The Recipe

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Clik here to view.

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Clik here to view. A small, white plate of brussels sprouts gratin.