Slice the corn tortilla into thin strips and toast them in a dry pan over medium heat for 3-5 minutes until golden and crispy, then set aside.
In a large skillet, heat the olive oil over medium-high heat and add the ground beef, breaking it apart with a spatula.
Cook the beef until fully browned, then drain any excess fat if necessary.
Stir in the black beans, chili powder, cumin, garlic powder, sea salt, and black pepper, cooking for another 2-3 minutes to allow the flavors to meld.
Roughly chop the romaine lettuce and halve the cherry tomatoes, then place them into a large serving bowl.
Top the fresh greens with the warm beef and bean mixture.
Slice the avocado and place it on top of the salad along with the toasted tortilla strips.
Drizzle the entire salad with fresh lime juice and toss gently before serving.