Place a large non-stick skillet over medium-high heat and add the ground beef, breaking it up with a spatula.
Sprinkle the chili powder, cumin, garlic powder, sea salt, and black pepper over the beef.
Cook the beef undisturbed for 3-4 minutes to develop a crispy, browned crust before stirring.
Continue cooking until the beef is fully browned and crispy, then remove from heat and drain any excess fat.
In a large bowl, layer the chopped romaine lettuce as the base.
Top the lettuce with halved cherry tomatoes, diced red bell pepper, and finely diced red onion.
Add the crispy seasoned ground beef to the center of the bowl.
Slice the avocado and place it on top, then drizzle the entire salad with fresh lime juice before serving.