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broccoli cauliflower gratin in a baking dish with a spoon

Cheddar Broccoli Cauliflower Gratin

Scrumptious cheddar broccoli cauliflower gratin with a crispy breadcrumb topping. This delicious cheesy side dish is perfect for serving guests during the holiday season, or pairing with your favorite protein for a yummy weeknight dinner!

Course Side Dish, Thanksgiving, Vegetarian
Keyword broccoli cauliflower gratin, cauliflower gratin, thanksgiving side dish, vegetarian side dish
Prep Time 15 minutes
Cook Time 1 hour
Total Time 1 hour 15 minutes
Servings 8 servings
Calories 248 kcal
Author Monique of AmbitiousKitchen.com


  • Nonstick cooking spray or olive oil, for greasing the baking dish
  • For the veggies:
  • 4 cups medium broccoli florets (from 1 head broccoli)
  • 4 cups medium cauliflower florets (from 1 head cauliflower)
  • 3 medium carrots, sliced
  • For the cheese sauce:
  • 2 tablespoons Simply Nature Organic Salted Butter
  • cup Baker’s Corner All-Purpose Flour (whole wheat or gluten free 1:1 flour will all work)
  • 2 1/3 cups Friendly Farms Unsweetened Almondmilk (skim, 2%, whole milk will all work)
  • 1 teaspoon garlic powder
  • ¼ teaspoon salt, plus more to taste
  • Lots of freshly ground black pepper
  • 8 ounces Happy Farms Sharp Cheddar Cheese, cut into small cubes
  • 1/3 cup Priano Parmesan Cheese
  • For the topping:
  • 3/4 cup Chef’s Cupboard Panko Breadcrumbs
  • 1 tablespoon Simply Nature Organic Salted Butter, melted


  1. Preheat your oven to 375 degrees F. Spray 2 ½ quart baking dish or 9x9 inch baking pan with nonstick cooking spray, or grease with olive oil or butter. Add broccoli florets, cauliflower florets and sliced carrots to prepared baking dish. Set aside.
  2. In a large skillet or pot add butter and place over medium heat. Once butter is melted, whisk in a little bit of the flour and then slowly add in milk, a little bit at a time, alternating with the flour and vigorously whisking away any lumps. Bring mixture to a boil, then reduce heat to low and simmer for a few minutes stirring every so often, until the sauce thickens up similar to a gravy. Stir in garlic powder, salt and LOTS of freshly ground black pepper. If the sauce is WAYYY too thick, feel free to add in a splash more milk. If the sauce is two thin, stir in another tablespoon of flour.
  3. Next add in sharp cheddar cheese and parmesan cheese and stir until completely melted into the sauce. Taste and add more salt and pepper, if desired. A fairly salty cheese sauce is best!
  4. Pour cheese sauce evenly over the veggies in the baking dish. Cover with foil and bake for 30 minutes.
  5. In a medium bowl, mix together breadcrumbs with 1 tablespoon of melted butter.
  6. After 30 minutes of baking time, remove the foil from the baking dish, evenly sprinkle breadcrumbs on top of the veggies and bake UNCOVERED for 20-30 minutes more until breadcrumbs are slightly golden brown and veggies are fork tender. Serve 6-8.

Recipe Notes

You can easily make this recipe gluten free by using a gluten free 1:1 flour and gluten-free breadcrumbs.

Nutrition Facts
Cheddar Broccoli Cauliflower Gratin
Amount Per Serving (1 serving (based on 8))
Calories 248 Calories from Fat 141
% Daily Value*
Fat 15.7g24%
Saturated Fat 8.6g54%
Carbohydrates 18.2g6%
Fiber 3.9g16%
Sugar 3.5g4%
Protein 12.9g26%
* Percent Daily Values are based on a 2000 calorie diet.