In a mixing bowl, combine the cream cheese, sour cream, mayo, half of the mozzarella, half of the parmesan, and a quarter of the pizza sauce until smooth.
Cut the pepperoni into quarters or chop it into small pieces, reserving about a dozen whole pepperoni for the top of the dip. Stir the pepperoni pieces into the cream cheese mixture.
Spread the cream cheese mixture into the bottom of a 9-inch pie plate. Layer with the remaining pizza sauce and the remaining mozzarella and parmesan. Top with the reserved pepperoni.
Baked for 20 minutes or until the cheese bubbles along the edges.
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Notes
To serve: Serve with tortilla chips, crackers, crostini, sliced French bread, or mini naan.To make ahead: Assembled the dip and store it in the refrigerator until ready to bake. Bring to room temperature before baking.Storage: Store dip in the refrigerator for up to five days. Microwave to reheat.