Oven-Baked Cauliflower Broccoli Gratin Recipe

This Oven-Baked Cauliflower Broccoli Gratin combines hearty vegetables and a creamy béchamel sauce topped with melted cheddar cheese for a comforting side dish. Perfect for family dinners or a festive gathering, this gratin is not only delicious but also adds a vibrant touch to any meal table.



  • 400 grams cauliflower, cut into florets
  • 400 grams broccoli, cut into florets
  • 2 carrots, peeled and sliced
  • 1 potato, peeled and sliced
  • 1 teaspoon salt
  • 1/2 cup water

Béchamel Sauce:

  • 2 tablespoons butter
  • 2 tablespoons all-purpose flour
  • 500 ml milk
  • 1 teaspoon salt
  • 1 teaspoon black pepper
  • A pinch of nutmeg


  • Grated cheddar cheese (as much as you prefer for topping)


  1. Preheat the Oven and Prepare Vegetables:
    • Preheat your oven to 200°C (400°F).
    • In a large baking dish, arrange the cauliflower, broccoli, carrots, and potato slices. Sprinkle with 1 teaspoon of salt and add 1/2 cup of water.
  2. Cook Vegetables:
    • Cover the dish with aluminum foil and bake in the preheated oven for about 20 minutes, or until the vegetables are just becoming tender.
  3. Prepare the Béchamel Sauce:
    • In a saucepan over medium heat, melt the butter. Stir in the flour and cook for 1-2 minutes until it forms a paste but does not brown.
    • Gradually add the milk, whisking continuously to prevent any lumps, until the sauce thickens.
    • Season with salt, black pepper, and a pinch of nutmeg. Remove from heat once the sauce is creamy and smooth.
  4. Assemble the Gratin:
    • Remove the vegetables from the oven. Pour the béchamel sauce evenly over the partially cooked vegetables.
    • Sprinkle a generous amount of grated cheddar cheese over the top.
  5. Bake:
    • Return the dish to the oven, uncovered, and bake for an additional 20-25 minutes or until the top is golden and bubbly.
  6. Serving:
    • Let the gratin cool for a few minutes before serving to allow the sauce to set slightly.
    • Garnish with additional herbs or spices if desired.


  • Variations: Feel free to add other vegetables like mushrooms or bell peppers for more flavor and texture.
  • Cheese Options: Apart from cheddar, you can use Gruyère, Parmesan, or a mix of your favorite melting cheeses for a richer taste.
  • Make Ahead: Assemble the gratin ahead of time and keep it refrigerated. Bake it just before you’re ready to serve for a fresh and hot side dish.

This gratin is a delightful way to enjoy your vegetables, with creamy textures and rich flavors that complement any main course beautifully.