Make the Dipping Sauce: Mix mashed avocado and ranch dressing. Chill until ready to use.
Prepare the Filling: Heat oil in a skillet. Sauté onions and red peppers. Add chicken, black beans, spinach, corn, and chiles. Sprinkle cheese and stir until melted. Stir in cilantro.
Assemble Egg Rolls: Divide filling among tortillas, roll tightly, and fold in ends.
Fry the Egg Rolls: Heat oil in a pot. Fry the egg rolls 2-3 minutes per side, until golden.
Serve: Slice in half and serve with avocado ranch sauce.