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Preheat your oven to 375°F. Lightly grease a 9x13 inch baking dish (or similar 2-quart capacity dish) with butter or cooking spray.

Bring a large pot of salted water to a boil. Add the cauliflower florets and cook for 3-5 minutes, until crisp-tender. Drain well and spread the cauliflower in the prepared baking dish. Season with 1 teaspoon salt and 1/2 teaspoon black pepper.

In a medium saucepan, melt 3 tablespoons of unsalted butter over medium heat. Whisk in the all-purpose flour and cook for 1-2 minutes, stirring constantly, to create a roux.

Gradually whisk in the whole milk until smooth. Bring the mixture to a gentle simmer, stirring constantly, until it thickens slightly, about 3-5 minutes. Reduce heat to low.

Stir in the softened cream cheese until fully melted and smooth. Add the shredded sharp cheddar cheese and Gruyere cheese, stirring until melted and the sauce is creamy. Stir in the Dijon mustard, garlic powder, onion powder, 1/2 teaspoon salt, and 1/4 teaspoon black pepper. Taste and adjust seasoning as needed.

Pour the cheese sauce evenly over the cauliflower in the baking dish, ensuring all florets are coated.

In a small bowl, combine the Panko breadcrumbs, everything bagel seasoning, and 2 tablespoons of melted unsalted butter. Toss until the breadcrumbs are evenly coated.

Sprinkle the everything bagel topping evenly over the cheese sauce and cauliflower.

Bake for 25-30 minutes, or until the gratin is bubbly around the edges and the topping is golden brown and crispy. Let rest for 5 minutes before serving.


Preheat your oven to 375°F. Lightly grease a 9x13 inch baking dish (or similar 2-quart capacity dish) with butter or cooking spray.

Bring a large pot of salted water to a boil. Add the cauliflower florets and cook for 3-5 minutes, until crisp-tender. Drain well and spread the cauliflower in the prepared baking dish. Season with 1 teaspoon salt and 1/2 teaspoon black pepper.

In a medium saucepan, melt 3 tablespoons of unsalted butter over medium heat. Whisk in the all-purpose flour and cook for 1-2 minutes, stirring constantly, to create a roux.

Gradually whisk in the whole milk until smooth. Bring the mixture to a gentle simmer, stirring constantly, until it thickens slightly, about 3-5 minutes. Reduce heat to low.

Stir in the softened cream cheese until fully melted and smooth. Add the shredded sharp cheddar cheese and Gruyere cheese, stirring until melted and the sauce is creamy. Stir in the Dijon mustard, garlic powder, onion powder, 1/2 teaspoon salt, and 1/4 teaspoon black pepper. Taste and adjust seasoning as needed.

Pour the cheese sauce evenly over the cauliflower in the baking dish, ensuring all florets are coated.

In a small bowl, combine the Panko breadcrumbs, everything bagel seasoning, and 2 tablespoons of melted unsalted butter. Toss until the breadcrumbs are evenly coated.

Sprinkle the everything bagel topping evenly over the cheese sauce and cauliflower.

Bake for 25-30 minutes, or until the gratin is bubbly around the edges and the topping is golden brown and crispy. Let rest for 5 minutes before serving.
