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The sprouts should be bright green when they come out of the pot, with just a little resistance when a knife slips into the center. I used to think that meant they were ready to serve, but this Brussels Sprout Gratin still has a stretch in the oven ahead. Giving them a brief boil first means they finish tender under the sauce, while the panko topping has time to turn golden.

The sauce starts with a butter-and-flour roux, then milk and cream go in gradually so it thickens without lumps. I take the pan off the heat before stirring in the Gruyere; the cheese melts into the warm sauce without being cooked over direct heat. Each bite has tender sprouts under a creamy, nutmeg-scented sauce and a crisp, buttery top.

Why the Sprouts Need a Head Start Before the Sauce Goes On

Brussels sprouts can take longer to soften than the panko needs to brown. If they go into the baking dish raw, the topping may be ready before the centers are tender. A short boil solves that timing problem: the sprouts begin cooking in water, then finish in the oven while the sauce bubbles and the crumbs toast.

There’s a useful middle ground here. Cook them until a knife meets only slight resistance, not until they’re falling apart. They’ll soften further as the gratin bakes, so fully tender sprouts at the boiling stage can turn mushy in the finished dish. Keeping the halves intact also gives the sauce room to settle around them instead of burying a pile of loose leaves.

Drain them well before arranging them in the dish. Extra water clinging to the sprouts thins the cheese sauce at the bottom, and the gratin is best when the sauce stays creamy rather than pooling. A few minutes in the colander while you make the sauce is time well spent.

What the Gruyere, Cream, and Panko Each Bring to the Gratin

• Brussels sprouts — Choose firm sprouts with compact, green leaves. Trim the ends and halve them so they cook evenly during the brief boil and sit securely in the baking dish.
• Unsalted butter and all-purpose flour — Together they form the roux that thickens the milk and cream. Cook the flour for the full minute so the sauce doesn’t taste floury, and whisk as the liquid goes in to keep the base smooth.
• Whole milk and heavy cream — Whole milk gives the sauce its pourable body, while the cream makes it richer. Both are doing different work here; the combination coats the sprouts without making the sauce feel too heavy.
• Gruyere — Its nutty, savory flavor and melting texture make it the center of the sauce. Shred it finely so it melts readily into the warm liquid.
• Panko and Parmesan — Panko makes a lighter, crispier cap than a fine crumb, and Parmesan adds a savory, salty edge. Stir the melted butter through the topping so the crumbs brown evenly rather than staying dry in patches.
• Nutmeg, black pepper, and kosher salt — The small pinch of nutmeg gives the creamy sauce warmth without making it taste sweet. Season the sauce before pouring it over the sprouts so the seasoning is distributed throughout.

From Bright-Green Sprouts to a Bubbling, Golden Top

Blanch the Halved Sprouts

Heat the oven to 400°F and coat a 2 1/2-quart baking dish with cooking spray. Bring 12 cups of water to a boil in a 5-quart pot, add the trimmed, halved Brussels sprouts, and cook for 4-5 minutes. Look for bright green color and a knife that meets only slight resistance at the center. Drain them well, then arrange the halves in the prepared dish.

Build a Smooth, Thick Sauce

Melt the butter in a 2-quart saucepan over medium heat, whisk in the flour, and cook for 1 minute. Gradually whisk in the milk and cream; adding them in stages helps prevent lumps. Bring the mixture to a simmer and cook for 3-5 minutes, stirring, until it’s thick enough to coat the back of a spoon. If it still runs off the spoon like milk, give it more time to thicken.

Melt the Gruyere and Coat the Sprouts

Remove the saucepan from the heat before stirring in the kosher salt, black pepper, nutmeg, and Gruyere. Stir until the cheese melts into the sauce; you’re looking for a smooth, creamy consistency. Pour the sauce evenly over the sprouts so it reaches between the halves. Don’t leave a thick pool in one corner of the dish.

Add the Crumbs and Bake Until Bubbling

Stir the panko, Parmesan, and melted butter together, then scatter the mixture evenly over the gratin. Bake uncovered for 20-25 minutes, until the topping is golden brown and the sauce bubbles around the edges. The bubbling at the sides is a helpful cue that the center is hot, too. Let the gratin rest for 10 minutes before serving so the sauce settles around the sprouts.

Two Small Changes for a Different Brussels Sprout Gratin

Questions That Come Up When Making Brussels Sprout Gratin

Brussels Sprout Gratin

Brussels sprout gratin bakes tender Brussels sprouts in a creamy Gruyere cheese sauce under a golden panko and Parmesan topping. Blanching the sprouts first helps them bake up tender while the sauce bubbles around the edges.

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Prep Time 15 minutes mins

Cook Time 33 minutes mins

resting time 10 minutes mins

Total Time 58 minutes mins

Servings: 6 servings

Course: Side Dish

Cuisine: American

Calories: 460

Ingredients Equipment Method Notes

Ingredients

  

Brussels sprouts

• 1 Cooking spray for coating
• 12 cups water
• 1.5 lb Brussels sprouts trimmed and halved

Cheese sauce

• 3 tbsp unsalted butter
• 3 tbsp all-purpose flour
• 1.5 cups whole milk
• 0.5 cup heavy cream
• 0.5 tsp kosher salt
• 0.25 tsp black pepper
• 0.125 tsp ground nutmeg
• 1 cup Gruyere cheese shredded

Topping

• 0.75 cup panko breadcrumbs
• 0.33 cup Parmesan cheese grated
• 2 tbsp unsalted butter melted

Equipment

• 1 2 1/2-quart baking dish

Method

 

Prepare the Brussels sprouts

1. Preheat the oven to 400°F.
2. Coat a 2 1/2-quart baking dish with cooking spray.
3. Bring the water to a boil in a 5-quart pot.
4. Add the Brussels sprouts and cook for 4-5 minutes, until bright green and just tender when pierced with a knife.
5. Drain the Brussels sprouts well.
6. Arrange the Brussels sprouts in the prepared baking dish.

Make the cheese sauce

1. Melt the butter in a 2-quart saucepan over medium heat, whisk in the flour, and cook for 1 minute.
2. Gradually whisk in the milk and cream, bring to a simmer, and cook for 3-5 minutes, stirring, until thick enough to coat the back of a spoon.
3. Remove the saucepan from the heat and stir in the salt, pepper, nutmeg, and Gruyere until the cheese melts.
4. Pour the sauce over the Brussels sprouts.

Assemble and bake

1. Stir together the panko, Parmesan, and melted butter.
2. Scatter the mixture evenly over the gratin.
3. Bake uncovered for 20-25 minutes, until the topping is golden brown and the sauce is bubbling around the edges.
4. Let the gratin rest for 10 minutes before serving.

Notes

For the best texture, drain the Brussels sprouts well before arranging them in the dish. Refrigerate leftovers for up to 4 days; freezing is not recommended because the cream sauce may separate. For a gluten-free variation, use gluten-free flour and panko breadcrumbs.