Preheat oven to 375°F. Line a regular size muffin tin with silicone liners or grease lightly with oil
In a blender or food processor add all ingredients. Blend until evenly mixed, about 1 minute. Scrap down the sides as needed and process until evenly mixed.
Transfer to a bowl and stir in pepperoni and other pizza toppings. (At this point the batter can be kept in the fridge and baked later.)
Using a portion scoop fill prepared muffin tins almost to the top!
Top each one with a slice of pepperoni if desired.
Cook in preheated oven 17-22 minutes until slightly brown around the edges and puffed up over the top of the pan.
Place on baking rack and cool for a few minutes. Remove from pan and cool another 5 minutes. Serve warm with pizza sauce for dipping.
Freeze leftover pizza cheese buns in airtight container. Thaw and eat at room temperature or reheat in microwave.