Preheat oven to 375°F
Prepare potatoes and layer in baking dish
Make cheese sauce with butter, flour, milk, and heavy cream
Season sauce with salt, pepper, garlic powder, onion powder, and paprika
Mix in sharp cheddar, Monterey Jack, and mozzarella cheeses
Pour cheese sauce over potatoes
Bake covered for 30 minutes
Bake uncovered for 30 minutes until golden and bubbly
