Preheat the oven to 375 degrees. Warm your tortillas according to the package directions (this will prevent them from cracking or breaking).
Lightly coat each tortilla with a small amount of oil or spray with cooking spray. Using a muffin tin that’s been turned upside down, tuck each tortilla in between 4 of the muffin cups, creating a bowl. Bake the tortillas in the preheated oven for 8-12 minutes, until they are lightly browned and hardened.
Meanwhile, prepare the filling. In a large skillet, heat the avocado oil over medium heat. Add the onion and red bell pepper and cook until they are soft, about 5-8 minutes.
Add the black beans and seasoning and gently stir to incorporate. Turn the heat down a touch, and continue to cook until the beans are warm, about 3 minutes. Turn off the heat and gently stir in the lime juice.
Place your taco bowls on a baking sheet. Evenly divide the bean mixture between the eight cups. Top each bowl with some cheese and guacamole. Enjoy!