Spray a 12-cup muffin tin and set aside. Turn the dough onto a floured surface and use a rolling pin to roll it out into a 12-by-18-inch rectangle. Brush the olive oil over the dough and sprinkle with the chile flakes, garlic, Mozzarella, pepperoni, and oregano. Starting from the longer side, roll the dough up tightly, similar to how you make a cinnamon roll, and pinch the edges to seal, placing it seam-side down. You should have an 18-inch log. Cut into 24 slices, then smush two slices into each muffin cup, cut-side up and overlapping. (This whole process is a little messy and rustic but when they bake and rise they will look beautiful.) Cover with a kitchen towel and set aside for 30 minutes.