Cheesy Creamed Spinach Recipe

This is a recipe for a delicious and cheesy creamed spinach. It's easy and tastes much better than any store bought or frozen versions. I made it for Thanksgiving and it was great!
3 (10 ounce) bags clean fresh spinach, roughly chopped
1 1/4 cups heavy cream
1/4 cup butter
2 tablespoons minced garlic
3 tablespoons minced white onion
6 slices shredded provolone cheese
1/2 cup freshly grated Parmesan cheese
salt and pepper to taste