Preheat your oven to 375°F. Slice the corn tortilla into thin strips, place them on a baking sheet, and bake for 8-10 minutes until golden and crunchy.
In a non-stick skillet over medium-high heat, add the lean ground beef. Cook until fully browned, breaking it into small crumbles with a spatula.
Stir the chili powder, ground cumin, garlic powder, and sea salt into the beef. Add a tablespoon of water if needed to ensure the spices coat the meat evenly.
Drain and rinse the black beans, then add them to the skillet with the beef, stirring for 2 minutes until warmed through.
In a large serving bowl, create a bed of chopped romaine lettuce. Layer the diced red bell pepper, halved cherry tomatoes, and diced red onion on top.
Transfer the warm ground beef and black bean mixture onto the center of the salad.
Slice the avocado and arrange it over the beef.
Top the salad with a dollop of nonfat Greek yogurt and chunky salsa, then drizzle the fresh lime juice over the entire bowl.
Garnish with the toasted tortilla strips for a satisfying crunch and serve immediately.