PREHEAT oven to 400° F.
SPRAY pan with nonstick cooking spray; spread the alfredo sauce on the bottom of pan.
MEASURE out cheeses, pepperoni and roasted peppers.
BOIL spaghetti for 1 minute and drain well.
PLACE spaghetti in large bowl; add marinara, pepperoni, peppers, Parmesan and Romano. Mix well.
PUT in 8” x 8” baking pan. Top with mozzarella and whole sliced pepperoni. Bake uncovered for 35 minutes.
Cook’s Tip: Use turkey pepperoni or sausage, add ground beef, mushrooms, sun-dried tomatoes, spinach, olives or zucchini.