Preheat oven to 375º F.
In large saucepan, bring some water to a boil, add a small palmful of salt and the macaroni noodles, and cook according to box directions. Drain and return to pan. Add American cheese and heavy cream, and stir until cheese has fully melted.
Stir in sauce, then fold in mozzarella and provolone.
Lightly oil 1 - 2 single serving cast iron fajita skillets, or small baking dishes, and pile on the mac & cheese.
Spoon as much pizza sauce as you like over the top. Top with handfuls of mozzarella-provolone cheese. Grate parmesan over shredded cheese. Top with slices of pepperoni.
Pop into the oven and bake until pepperoni is crispy and shredded cheese has melted. *If a more crispy pepperoni is desired, you can turn it up to broil at the end, but watch closely so that you don't burn it (or the mac & cheese).