01 - In a large mixing bowl, thoroughly combine shredded chicken, buffalo wing sauce, mozzarella cheese, blue cheese if using, chopped celery, green onions, garlic powder, and ground black pepper until evenly mixed.
02 - Place an egg roll wrapper on a clean work surface with one corner facing you. Spoon 2 to 3 tablespoons of chicken mixture into the center. Fold the bottom corner over the filling, then fold in both sides. Roll tightly, brushing the top corner with beaten egg to seal.
03 - Repeat the rolling process with the remaining wrappers and filling until all are prepared.
04 - Heat approximately 2 inches of vegetable oil in a deep, heavy-bottomed pot to 350°F.
05 - Working in batches, gently lower egg rolls into the hot oil and fry until golden brown and crisp, about 3 to 4 minutes per batch. Transfer to a plate lined with paper towels to drain excess oil.
06 - Arrange on a serving platter and serve warm, accompanied by ranch or blue cheese dressing for dipping.