Special equipment: a deep-frying thermometer
Heat the olive oil in a large nonstick saute pan over medium-high heat. Add the onion and a pinch of salt and cook, stirring occasionally, until lightly browned, about 5 minutes. Add the sausage and cook, using the back of a wooden spoon to crumble into fine pieces, until lightly browned and cooked through, about 5 minutes. Stir in the pepperoni, pizza sauce, oregano, granulated garlic and pepper flakes. Remove to a large bowl and allow to cool slightly. Fold in the mozzarella and season to taste with additional salt if needed.
Put 1 wonton wrapper down on a flat work surface. Put a slightly heaping teaspoon of filling in the middle of the upper half of the wrapper, then put a slightly heaping teaspoon of filling in the middle of the bottom half, making sure that the fillings are evenly spaced apart. Brush egg wash all around the fillings and on the edges of the wrapper. Fold both sides of the wrapper over the fillings letter-fold style, overlapping them and being careful not to press down on the fillings. Turn the wrapper over so that the seal is on the bottom, then use your fingers to gently press down in between the fillings and around the edges. Use a sharp knife to cut the wrapper in half between the fillings. Use your fingers to tightly seal both ends of the pizza rolls. Put the filled pizza rolls on a large baking sheet. Repeat this process with the remaining wrappers and filling.
Fill a Dutch oven halfway with canola oil and heat to 350 degrees F. Set a cooling rack over a baking sheet. Fry the pizza rolls in batches until golden brown and crispy, about 4 minutes. Transfer to the cooling rack. Once all the pizza rolls are fried, move them to a large serving platter and serve immediately.
Pizza rolls may be frozen once fried and cooled. To reheat, place the frozen pizza rolls on a baking sheet and bake at 450 degrees F until warmed through, 10 to 12 minutes.
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