Preheat your oven to 400°F (200°C).
Heat the olive oil in a skillet over medium-high heat and sauté the diced yellow onion and bell pepper until softened.
Add the ground beef to the skillet, breaking it up with a spatula, and cook until browned and no longer pink.
Stir in the chili powder, ground cumin, garlic powder, sea salt, and black pepper until the beef is well-coated.
Mix in the black beans and tomato salsa, simmering for 2 minutes to allow the flavors to meld.
Transfer the beef mixture into a small oven-safe baking dish or individual ramekin.
Slice the corn tortilla into thin strips and arrange them over the top of the beef mixture along with the shredded cheddar cheese.
Place the dish in the oven and bake for 8-10 minutes until the cheese is bubbly and the tortilla strips are golden and crispy.
Remove from the oven and finish with a dollop of plain Greek yogurt before serving.