Pepperoni Mac And Cheese

Name: Pepperoni Mac And Cheese
Ingredients: 1-pound box cavatappi pasta; 7 tablespoons butter, divided; 1/4 cup flour; 3 cups shredded pepper jack or mozzarella cheese (or a mix of both); 3 cups whole milk; 1/2 cup heavy cream; 1 tablespoon sriracha sauce; 2 teaspoons mustard; 1 teaspoon garlic powder; 1 teaspoon Italian seasoning; Salt and pepper, to taste; 1/2 red bell pepper, diced; 4 ounces Sugardale Pepperoni (1/2 of 8-ounce package) sliced (reserve some whole slices for topping dish); 1/2 cup panko breadcrumbs