Preheat oven to 400°F and line baking sheet with parchment paper.
In a microwave-safe bowl, melt mozzarella in 30 - second increments until fully melted, stirring to avoid burning.
Add all crust ingredients to the bowl of mozzarella and, using hands, knead together until fully combined. Roll dough into a ball and flatten into ¼ inch circle on a prepared baking sheet.
Bake for 10 minutes, remove from oven, flip, and bake for another 2 minutes.
While crust is baking, in a small bowl, mix the tomato sauce with the salt, red pepper flakes, Italian seasoning, and black pepper.
Remove crust from oven and top with sauce, cheese, and pepperoni.
Return pizza to oven and bake for 5 - 7 minutes.
Remove from oven, allow to cool for 5 - 10 minutes, cut, serve, and enjoy!