Preheat your oven to 375°F.
Heat the avocado oil in a large skillet over medium-high heat.
Add the ground beef, diced yellow onion, and red bell pepper to the skillet.
Cook, breaking up the beef with a spatula, until the meat is browned and the vegetables are softened.
Stir in the chili powder, ground cumin, garlic powder, sea salt, and black pepper until the beef is well coated.
Add the black beans, red enchilada sauce, and the chopped corn tortilla to the skillet.
Mix all ingredients until the tortilla pieces are fully submerged and the mixture is well combined.
Transfer the beef and tortilla mixture into a small oven-safe baking dish.
Sprinkle the shredded sharp cheddar cheese evenly over the top of the mixture.
Place the dish in the oven and bake for 10 to 15 minutes, or until the cheese is melted and bubbly.
Remove from the oven and allow to cool for a few minutes before serving with a dollop of non-fat Greek yogurt on top.