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Not sure where I originally found this one, if you know, drop it in the comments and I can update my page : )

Ingredients

Kosher salt, as needed, plus 1/2 teaspoon
1 large head cauliflower, cut into small florets
Vegetable oil spray
1 cup heavy cream
2 ounces cream cheese, cut into small pieces
1 1/2 teaspoons Dijon mustard
1 1/2 cups shredded sharp Cheddar, plus 1/2 cup for topping the casserole
1/4 teaspoon freshly ground black pepper
1/8 teaspoon garlic powder
Equipment: 8 by 8-inch baking dish

Directions

Preheat oven to 375 degrees F. Bring a large pot of water to a boil. Season the water with salt.

Spray the baking dish with vegetable oil spray.

Cook the cauliflower in the boiling water until crisp-tender, about 5 minutes. Drain well and pat between several layers of paper towels to dry. Transfer the cauliflower to the baking dish and set aside.