Preheat your oven to 400°F (200°C).
In a large mixing bowl, combine the ground beef (or turkey), diced onion, diced bell pepper, drained black beans, and taco seasoning. Mix until evenly coated.
Spread the mixture evenly onto a large baking sheet.
Bake in the preheated oven for 15 minutes, or until the meat is cooked through and the vegetables are tender.
Remove the baking sheet from the oven and carefully layer the tortillas on top of the mixture.
Sprinkle the shredded cheese over the tortillas and return the baking sheet to the oven for an additional 5 minutes or until the cheese is melted and bubbly.
Once done, remove from oven and top with halved cherry tomatoes, diced avocado, and fresh cilantro.
Serve with sour cream and lime wedges on the side for added flavor.