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Preheat your oven to 375°F (190°C). Lightly grease a 9x13 inch baking dish.

In a large pot, bring lightly salted water to a boil. Add the broccoli and cauliflower florets and blanch for 3-4 minutes until tender-crisp. Drain well and set aside.

In a medium saucepan over medium heat, melt the 3 tablespoons of butter. Add the minced garlic and cook for 1 minute until fragrant, being careful not to burn it.

Whisk in the flour and cook for 1-2 minutes, stirring constantly, to create a roux. Gradually whisk in the warm milk until the sauce is smooth and thickened.

Remove the saucepan from the heat. Stir in the shredded gruyere cheese and grated Parmesan cheese until melted and smooth. Season with nutmeg, salt, and pepper.

Gently fold the blanched broccoli and cauliflower into the cheese sauce, ensuring all the vegetables are well coated.

Pour the vegetable and cheese mixture into the prepared baking dish.

In a small bowl, combine the breadcrumbs and the melted 1 tablespoon of butter. Sprinkle this mixture evenly over the top of the gratin.

Bake for 20-25 minutes, or until the topping is golden brown and the sauce is bubbly.

Let the gratin rest for 5 minutes before serving.


Preheat your oven to 375°F (190°C). Lightly grease a 9x13 inch baking dish.

In a large pot, bring lightly salted water to a boil. Add the broccoli and cauliflower florets and blanch for 3-4 minutes until tender-crisp. Drain well and set aside.

In a medium saucepan over medium heat, melt the 3 tablespoons of butter. Add the minced garlic and cook for 1 minute until fragrant, being careful not to burn it.

Whisk in the flour and cook for 1-2 minutes, stirring constantly, to create a roux. Gradually whisk in the warm milk until the sauce is smooth and thickened.

Remove the saucepan from the heat. Stir in the shredded gruyere cheese and grated Parmesan cheese until melted and smooth. Season with nutmeg, salt, and pepper.

Gently fold the blanched broccoli and cauliflower into the cheese sauce, ensuring all the vegetables are well coated.

Pour the vegetable and cheese mixture into the prepared baking dish.

In a small bowl, combine the breadcrumbs and the melted 1 tablespoon of butter. Sprinkle this mixture evenly over the top of the gratin.

Bake for 20-25 minutes, or until the topping is golden brown and the sauce is bubbly.

Let the gratin rest for 5 minutes before serving.
