Original Cauliflower Mac and Cheese Casserole

INGREDIENTS

1/2 tsp

kosher salt, as needed, plus

large head cauliflower, cut into small florets

3/4 cup

heavy cream

2 oz

cream cheese, cut into small pieces

1 1/2 tsp

Dijon mustard

2 cups

shredded sharp Cheddar cheese, plus 1/2 cup for topping

1/4 tsp

black pepper

1/8 tsp

garlic powder

vegetable cooking spray