In a medium pan over medium-high heat, saute onion and bell pepper in 1 tablespoon oil for 2-3 minutes or until tender. Add the black beans and taco seasoning. Cook for another minute. Transfer mixture into a small bowl and set aside.
Rinse and wipe down pan and return to heat. Drizzle with a light layer of oil or spray with cooking spray.
In a small bowl, lightly mash the avocados with a fork. Stir in cilantro and juice of 1/2 lime, season with salt and pepper to taste. Spread a quarter of mashed avocado onto half of a tortilla. Top with bean mixture and 1/4th cup of cheese. Fold the tortilla closed over the veggies. Repeat until all tortillas are filled and all fillings are used.
Cook on medium-high heat for 2-3 minutes per side or until the outside is crispy and cheese has fully melted. Serve with your favorite salsa or sour-cream, Enjoy!