Preheat oven to 400 degrees. Line a rimmed baking sheet with parchment paper. Set aside.
In the bowl of a food processor, combine pepperoni, sausage, parmesan, scallions, pizza seasoning, red pepper flakes, and salt and pepper to taste. Pulse until mixture is finely chopped and well combined. Transfer to a medium bowl. Add pizza sauce and mix to combine.
On a lightly floured work surface, roll pizza dough to a dimension of 12” x 9”.
Spread pepperoni mixture over dough, leaving a ½-inch border around the edges.
Sprinkle with mozzarella cheese.
Starting with the long end, roll dough into a log. As you spread filling and roll log, dough may stretch to a length of up to 16”.
Cut into 12 pieces and place on prepared baking sheet, spacing rolls 2 inches apart.
Transfer to oven and bake until golden and bubbling, about 20 minutes. Serve.