Roasted Brussels Sprouts Gratin

If roasted garlic brussels sprouts did not change your mind about brussels sprouts, then hopefully this roasted brussels sprouts gratin with garlic crumble and crispy onion topping will.

Brussels sprouts are legit one of my favorite vegetables of all time. We have roasted brussels sprouts as least once a week and it’s always on my shopping list. I feel like those that despise them are just scarred from having a bad experience (re: boiled). You’ve gotta give this one a shot. The topping itself is WORTH IT.

Will you just LOOK at that gorgeous topping? Breaking into it was a little heartbreaking because it was like shattering the sugar top of creme brulee — but it also meant one step closer to having this delicious gratin on my plate.

I had extra garlic parmesan paste from my extra garlicky and cheesy bread so I mixed that with panko breadcrumbs to make the topping for this brussels sprouts gratin. But I didn’t stop there. I then used gourmet (as TJ’s would call it) fried onions and elevated the dish even more.

GAH YOU GUYS! You just seriously have to make this. Even if it’s not for Thanksgiving; what about for like a party or potluck? Or what if you just want pure comfort food in the form of brussels sprouts and garlicky oniony goodness? Because that’s my favorite kind of party. Well, sort of. Add some form of bubbly and friends…I’m all over that sign up list!

I wasn’t expecting this dish to be that awesome but since it is, I think this is THE dish I am bringing to Thanksgiving dinner this year! To be honest, this doesn’t have to be a Thanksgiving side dish. This can be a side dish year-round because WHY NOT?! I know Thanksgiving is pretty much all about side dishes but why not make side dishes a year-round thing?

I’m tempted to throw a side dish only party in July.

Roasted Brussels Sprouts Gratin with Garlic Crumble and Fried Onion Topping

Pretty sure if you hate brussels sprouts, you haven't had them the right way. This roasted brussels sprouts gratin with garlic crumble and fried onion topping is going to elevate your side dish game!

5 from 4 votes

Prep Time: 35 minutes

Cook Time: 25 minutes

Total Time: 1 hour

Servings: 6

Author: Julie Chiou

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Ingredients 

½1x2x3x

US CustomaryMetric

• ▢ 2 pounds brussels sprouts, sliced in half

For the bechamel sauce:

• ▢ 4 tablespoons unsalted butter
• ▢ 3 tablespoons all-purpose flour
• ▢ 1 ⅔ cup whole milk, room temperature
• ▢ Pinch ground nutmeg
• ▢ Salt and pepper, to taste

For the garlic crumble and crispy onion topping

• ▢ 3 cloves of garlic, minced
• ▢ 3 tablespoons grated parmesan cheese
• ▢ ¼ cup olive oil
• ▢ 1 cup panko breadcrumbs
• ▢ 1 cup or more, definitely more crispy onions

The default measuring system for this website is US Customary. Unit conversions are provided for convenience and as a courtesy only. While we strive to provide accurate unit conversions, please be aware that there may be some discrepancies.

Equipment

• Large rimmed baking sheet
• Baking dish

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Instructions

• Preheat oven to 400 °F and place brussels sprouts onto a nonstick baking sheet. Drizzle olive oil all over then season with salt.
• Roast for 20 minutes. Remove then set aside. Turn down the oven to 375 °F
• Have on hand a 2 or 3 quart casserole dish.
• While the brussels sprouts are roasting, begin making your bechamel sauce.
• In a deep skillet, melt butter over medium heat then add flour, stirring and whisking until smooth.
• Carefully add the milk and continue whisking until thickened, about 2-3 minutes.
• Season with salt and pepper and pinch of ground nutmeg.
• Remove from heat then add the roasted brussels sprouts to the skillet. Toss to cover brussels sprouts in the sauce.
• Pour the brussels sprouts into the casserole dish and smooth into an even layer.
• In a small bowl, mix together the garlic, parmesan, panko breadcrumbs, and olive oil. 
• Using your hands, evenly sprinkle the topping all over the top of the brussels sprouts.
• Bake for 25 minutes or until the top is browned.
• Remove from oven and sprinkle crispy onions on top.
• Let cool for 10-15 minutes before serving.

NUTRITION FACTS

Serving: 1 Serving | Calories: 311 kcal | Carbohydrates: 24 g | Protein: 7 g | Fat: 22 g | Fiber: 4 g | Sugar: 5 g

This website provides approximate nutrition information for convenience and as a courtesy only. Nutrition information can vary for a variety of reasons. For the most precise nutritional data use your preferred nutrition calculator based on the actual ingredients you used in the recipe.

Course: Side Dish

Cuisine: American

Keyword: side dish ideas, Thanksgiving