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A baking dish full of Brussels Sprouts au Gratin.
5 from 1 vote

Brussels Sprouts au Gratin

Brussels Sprouts au Gratin is a healthier twist on the classic potato dish. Brussels sprouts are mixed with a buttery, creamy sauce, topped with Gruyere cheese and breadcrumbs, then baked to toasty perfection.

Course Side Dish
Cuisine American
Prep Time 20 minutes
Cook Time 40 minutes
Total Time 1 hour
Servings 10 servings
Calories 194 kcal


  • 2 lbs. Brussels sprouts
  • 2 Tbsp. oil avocado or olive
  • ¾ tsp. salt
  • ¼ tsp. black pepper
  • 2 Tbsp. butter
  • 2 cloves garlic finely minced
  • 2 Tbsp. flour or a gluten-free 1-to-1 blend
  • 1 cup milk or a plant-based alternative
  • 1 tsp. tarragon fresh, finely chopped
  • 1 tsp. thyme fresh, finely chopped
  • ½ tsp. salt to taste
  • ¼ tsp. black pepper
  • ¾ cup Gruyere cheese shredded
  • ½ cup breadcrumbs Panko-style
  • ¼ cup Parmesan cheese grated
  • 2 Tbsp. butter melted


  1. Preheat the oven to 400 degrees.
  2. Trim the ends from the sprouts and cut them in half. Add to a 7x10-inch baking dish along with the oil, ¾ teaspoon salt, and ¼ teaspoon black pepper. Toss until well coated. Bake for 15 minutes, flipping halfway through.
  3. Add butter to a small saucepan over medium heat. Once melted, add the garlic and continue sauteing for 30 seconds, or until fragrant.
  4. Sprinkle in the flour and whisk until combined.
  5. Slowly begin adding in the milk, ¼ cup at a time, whisking well after each addition.
  6. Once all of the milk has been added and the sauce has thickened, stir in the tarragon, thyme, salt, and pepper.
  7. In a small bowl mix together the breadcrumbs, Parmesan cheese, and melted butter.
  8. Pour the sauce over the roasted Brussels sprouts. Sprinkle with the Gruyere cheese and then the Parmesan-breadcrumbs.
  9. Reduce the oven temperature to 350 degrees and bake for 25-30 minutes, or until the crumbs are golden.
  10. Let sit for 10-15 minutes before serving so the sauce can thicken up. Enjoy!

Recipe Video

Recipe Notes

Meal Prep and Storage

  • To Prep-Ahead: To save time, you can prep the Brussels sprouts a couple of days before, just leave them in the fridge until you're ready to use them. You can also make this dish in its entirety and just warm it up when you're ready to enjoy it, but wait to addd the cheese and breadcrumbs.
  • To Store: Keep leftovers in an airtight container in the refrigerator for up to 4 to 5 days.
  • To Freeze: While you can freeze this recipe, the Brussels sprouts might get soggy upon thawing. Be sure to completely cool before wrapping tightly and freezing for up to 6 months.
  • To Reheat: This dish is best warmed up in the oven at 350℉. You can use the microwave, but it will be mushy.

Nutrition Facts
Brussels Sprouts au Gratin
Amount Per Serving
Calories 194 Calories from Fat 108
% Daily Value*
Fat 12g18%
Saturated Fat 6g38%
Trans Fat 0.2g
Polyunsaturated Fat 1g
Monounsaturated Fat 4g
Cholesterol 25mg8%
Sodium 466mg20%
Potassium 399mg11%
Carbohydrates 15g5%
Fiber 4g17%
Sugar 2g2%
Protein 8g16%
Vitamin A 991IU20%
Vitamin C 78mg95%
Calcium 191mg19%
Iron 2mg11%
* Percent Daily Values are based on a 2000 calorie diet.