Heat oven to 350 degrees. Spray 8-inch square baking pan with nonstick cooking spray.
In large bowl, whisk eggs, cooking cream, parmesan cheese, and black pepper. Stir in popcorn, mozzarella cheese, and pepperoni.
Spread mixture in prepared pan, patting down with spatula or spoon. Bake about 15 minutes until set and lightly browned. Let sit 5 minutes. Cut into 16 bars. Serve warm with marinara sauce.