Pour marinara sauce into your large saucepan.
Heat it over medium-low temperature.
Stir occasionally to prevent sticking.
Let it warm for 5 minutes.
Add minced garlic to the sauce.
Sprinkle in Italian seasoning.
Stir everything together well.
Let flavors blend for 2 minutes.
Add heavy cream slowly while stirring.
This creates a creamy texture.
Mix until fully combined.
Keep heat at medium-low.
Add mozzarella, parmesan, and romano first.
Stir until they melt completely.
Then add provolone and fontina.
Keep stirring for smooth consistency.
Taste your sauce carefully.
Add salt if needed.
Sprinkle black pepper for extra flavor.
Stir one last time.