01 - In a large bowl, mix shredded chicken, buffalo sauce, mozzarella, blue cheese if desired, celery, green onions, garlic powder, and black pepper until thoroughly combined.
02 - Lay an egg roll wrapper on a clean work surface with one corner facing you. Add 2 to 3 tablespoons of the filling to the center.
03 - Fold the bottom corner over the filling, fold in the sides, and roll tightly. Brush the top corner with beaten egg to seal.
04 - Continue assembling with remaining wrappers and filling.
05 - Pour about 2 inches of vegetable oil into a deep pot and heat to 350°F.
06 - Fry egg rolls in batches for 3 to 4 minutes until golden and crisp. Drain on paper towels.
07 - Enjoy warm, served with ranch or blue cheese dressing for dipping.