01 - Prepare all filling ingredients and set up a work station with a large shallow bowl of warm water.
02 - Dip one rice paper sheet into the warm water for about 5–10 seconds until just pliable. Lay it flat on a clean, damp kitchen towel or cutting board.
03 - Spread about 1 teaspoon of pizza sauce in the center of the rice paper.
04 - Top with a small amount of mozzarella, olives, bell pepper, mushrooms, and onion. Sprinkle with oregano and red pepper flakes.
05 - Fold in the sides of the rice paper, then roll tightly from the bottom to enclose the filling (similar to rolling a burrito or spring roll).
06 - Repeat with remaining rice paper sheets and fillings.
07 - Heat olive oil in a large nonstick skillet over medium heat. Place rolls seam-side down in the pan and cook for 2–3 minutes per side, until golden and crisp. Work in batches if necessary.
08 - Remove and let cool slightly before serving. Serve with extra pizza sauce for dipping.