2Combine butter, minced garlic, 2 tbsp chopped parsley, and kosher salt in a small bowl. Stir to mix.
3Spread the butter mixture on 2 pieces of bread. Place them on a parchment-lined baking sheet and bake for 10 minutes. Remove from oven.
4Spread half of the mozzarella and Parmesan on one piece of bread. Push the cheese to the outside edges, leaving a small well in the middle. Sprinkle on some garlic powder.
5Place the other piece of garlic bread on top, and use a spoon to push down in the center to create a well. Pour the pizza sauce into the well and spread it out to the edges of the bread.
6Sprinkle the rest of the Parmesan and mozzarella, plus more garlic powder and red pepper flakes to taste on top of the pizza sauce. Top with the mini pepperoni.
7Bake for 10 more minutes. Remove from oven, garnish with extra parsley and serve immediately.