In a large bowl, combine the black beans, corn, red onion, red bell pepper, lime juice, cumin, salt, garlic granules, and pepper.
In a medium bowl, mash the avocado.
Lay an egg roll wrapper out on a clean surface with a corner facing you. Add about 2 tablespoons of mashed avocado to the bottom third of the wrapper.
Add about 3 tablespoons of the bean filling on top of the mashed avocado.
With a small bowl of water nearby, fold the bottom corner of the wrapper over the filling, fold in both sides, and moisten the edges with water to seal.
Finish rolling the egg roll and seal the top corner with water. Repeat the process with each egg roll.
Add half of the oil to a large frying pan over medium heat.
Add 6 of the egg rolls to the pan and cook for 4 minutes on each side or until they are golden brown. Repeat the cooking process with the remaining oil and egg rolls.
Remove the egg rolls from the pan and place on a paper towel to dry.