In a large saucepan, melt the butter over medium heat. Add the chopped onion and sauté until softened, about 5 minutes. Add the minced garlic and cook for another minute. Stir in the flour and cook for 1-2 minutes until lightly browned.
2 tablespoons unsalted butter, 1 small onion, 2 cloves garlic, ¼ cup all-purpose flour
Gradually whisk in the milk and heavy cream and cook until the sauce thickens, about 5-7 minutes. Stir in the shredded cheddar cheese, grated Parmesan cheese, Dijon mustard, salt, and pepper until the cheese is melted and the sauce is smooth.
1 cup milk, 1 cup heavy cream, 1 cup shredded cheddar cheese, ½ cup grated parmesan cheese, 1 teaspoon Dijon mustard, ¼ teaspoon smoked paprika, Salt and pepper to taste
Place the blanched broccoli and cauliflower florets in the prepared baking dish. Pour the cheese sauce over the vegetables and stir to coat evenly.
To Make the Topping:
In a small bowl, mix the panko breadcrumbs with the melted butter and sprinkle over the top of the casserole.
1 cup panko breadcrumbs, 3 tablespoons unsalted butter
Bake, uncovered, for 20-25 minutes, or until the casserole is bubbly and the topping is golden brown.
Let the casserole cool for a few minutes before serving.
Notes
The calories listed are an approximation based on the ingredients in the recipe card and a serving size of 1 cup of casserole. Actual calories will vary.
If you're unsure how much salt and pepper to add to the sauce, make the sauce, taste it, then add the salt and pepper to your preference.
Nutrition Facts
Creamy Broccoli and Cauliflower Bake
Serving Size
1 cup
Amount per Serving
Calories
345
% Daily Value*
Fat
26
g
40
%
Saturated Fat
16
g
80
%
Trans Fat
0.3
g
Polyunsaturated Fat
1
g
Monounsaturated Fat
6
g
Cholesterol
76
mg
25
%
Sodium
337
mg
14
%
Potassium
436
mg
12
%
Carbohydrates
19
g
6
%
Fiber
3
g
12
%
Sugar
5
g
6
%
Protein
11
g
22
%
Vitamin A
1.216
IU
0
%
Vitamin C
66
mg
80
%
Calcium
266
mg
27
%
Iron
1
mg
6
%
* Percent Daily Values are based on a 2000 calorie diet.