Cauliflower Au Gratin

January 9, 2026

Cauliflower Au Gratin is a classic comfort dish that transforms simple cauliflower into a rich, cheesy, and creamy casserole. With roots in French cuisine, “au gratin” refers to a dish baked with a topping of breadcrumbs and cheese until golden and bubbling. This dish is beloved for its combination of tender vegetables, velvety cheese sauce, and a lightly crisp, golden crust, making it a perfect side for holiday meals or cozy family dinners.

In this recipe, fresh cauliflower florets are lightly steamed or blanched, then layered in a creamy cheese sauce made from butter, cream, and a blend of cheeses such as Gruyère, cheddar, or Parmesan. The casserole is topped with breadcrumbs and extra cheese, then baked until the top is golden brown and crisp while the interior remains tender and rich. The result is a luscious, cheesy dish with a perfect balance of creaminess and crunch in every bite.

Perfect for holiday feasts, Sunday dinners, or as a comforting weeknight side, Cauliflower Au Gratin elevates a humble vegetable into a decadent treat. Its creamy, cheesy texture and golden topping make it appealing to both children and adults, proving that comfort food can be both elegant and satisfying. This recipe highlights the beauty of classic French techniques applied to modern, home-friendly ingredients.

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Cauliflower Au Gratin

Cauliflower Au Gratin

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Cauliflower Au Gratin is a classic comfort dish that transforms simple cauliflower into a rich, cheesy, and creamy casserole. With roots in French cuisine, “au gratin” refers to a dish baked with a topping of breadcrumbs and cheese until golden and bubbling. This dish is beloved for its combination of tender vegetables, velvety cheese sauce, and a lightly crisp, golden crust, making it a perfect side for holiday meals or cozy family dinners.

In this recipe, fresh cauliflower florets are lightly steamed or blanched, then layered in a creamy cheese sauce made from butter, cream, and a blend of cheeses such as Gruyère, cheddar, or Parmesan. The casserole is topped with breadcrumbs and extra cheese, then baked until the top is golden brown and crisp while the interior remains tender and rich. The result is a luscious, cheesy dish with a perfect balance of creaminess and crunch in every bite.

Perfect for holiday feasts, Sunday dinners, or as a comforting weeknight side, Cauliflower Au Gratin elevates a humble vegetable into a decadent treat. Its creamy, cheesy texture and golden topping make it appealing to both children and adults, proving that comfort food can be both elegant and satisfying. This recipe highlights the beauty of classic French techniques applied to modern, home-friendly ingredients.

  • Total Time: 60 minutes
  • Yield: 6 1x

Ingredients

Units Scale
  • 2 leeks (2 cups), cleaned, halved lengthwise, sliced 1/4-inch
  • 1 head cauliflower, broken into bite-sized florets
  • 2 tablespoons all purpose flour
  • 2 tablespoons butter
  • 4 ounces Gruyere cheese, grated
  • 1 1/3 cups milk
  • 1 teaspoon fresh thyme, minced
  • 1/8 teaspoon grated nutmeg
  • 1 teaspoon salt
  • 1/2 teaspoon pepper
Topping:
  • 1 tablespoon butter
  • 1 1/2 cups fresh breadcrumbs (3 slices of sandwich bread or rustic bread, pulsed in a food processor)
  • 1/4 teaspoon salt
  • 1/4 teaspoon pepper

Instructions

  1. Preheat oven to 400°F.
  2. Melt butter in a medium sized saucepan over medium heat. Add the sliced leeks and gently cook until completely softened, about 8 to 10 minutes.
  3. While the leeks are cooking, place cauliflower florets in a steamer basket in another saucepan over an inch of water. Bring water to a boil, cover, and steam the cauliflower for 4 minutes. Remove cauliflower from hot pan and set aside.
  4. Add 2 tablespoons flour to the leeks and butter. Cook for two minutes, stirring constantly. Slowly add milk while stirring to break up any lumps. Bring to a low simmer and continue to stir as the sauce thickens.
  5. Once the sauce is thick enough to coat the back of a spoon, stir in 3 ounces of the shredded cheese,  nutmeg, the thyme,  and salt.
  6. Spread a teaspoon of butter over the insides of a 2-quart gratin dish. Place the steamed cauliflower in an even layer in the dish. Pour the leek and cheese sauce over the cauliflower. Top with remaining cheese.
  7. Bake for 25 minutes.
  8. While the gratin is in the oven, melt 1 tablespoon butter in a small sauté pan over medium high heat. Add the fresh breadcrumbs and toast in the melted butter for 4 to 5 minutes, until lightly browned. Sprinkle with salt, and pepper. Remove from heat.
  9. After baking for 25 minutes, remove the gratin from the oven. Sprinkle toasted breadcrumbs over the top and return to the oven. Bake for 5 more minutes.
  • Author: Recipe Maker
  • Prep Time: 15 minutes
  • Cook Time: 45 minutes
  • Category: Side Dishes
  • Cuisine: French Recipes

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