Cut up the cauliflower into small pieces.  You can do this in a food processor or by hand.  Costco also sells a package that's already pre-cut and ready to go.

Place the cauliflower in a deep casserole dish and sprinkle with olive oil and all the seasonings.

Bake the cauliflower at 400 degrees for about 20 minutes or until it's tender.  The bigger the pieces the longer it will take to cook.

Add one whipped egg to 1 cup of Rao's Marinara sauce.  This will create an extra thick sauce to help the casserole stick together when it bakes.

Pour the prepared sauce over the cooked cauliflower while it's still warm.

Add the cheese and additional toppings for your pizza casserole.

Bake for another 10 minutes or so until all the cheese has melted and browned slightly.