Preheat the oven to 375°F.
In a medium bowl, mix together 8 oz cream cheese, ½ cup sour cream and ¼ cup mayonnaise until smooth. I used a stand mixer with a paddle attachment, but you can also use an electric hand mixer.
Stir in ½ cup of the mozzarella, ¼ cup grated Parmesan, and spices (½ tsp dried oregano, ¼ tsp dried rosemary, ⅛ tsp dried sage, and ⅛ tsp salt). Then hand mix in the ½ cup chopped pepperoni.
Spread the mixture evenly into a small baking dish or 10.25” cast iron skillet. Spoon the ½ cup pizza sauce over the top and gently spread it out.
Sprinkle the dip with the remaining ¾ mozzarella and place more full pepperoni slices on top.
Bake uncovered for 20–25 minutes, until hot, bubbly, and lightly golden on top.
Let cool for 5 minutes, then serve with crackers, bread, or crostini. Enjoy!