Prep Work
For the dressing: Combine 1/3 cup sour cream, 1/3 cup salsa, and ½ tablespoon taco seasoning. Set aside.
Slice the avocado in half lengthwise, remove the pit, and scoop the pulp into a small bowl. Add lime juice and 1/8 tsp. salt and use the back of a fork to mash it. Cover tightly with saran wrap and set aside.
Cook the Meat Mixture
Heat olive oil in a large skillet over medium-high heat. Add the ground beef, cook and crumble for 7 minutes, or until brown and cooked through. Drain grease.
Reduce heat to low. Add 2 tablespoons taco seasoning and toss to coat. Add the 3/4 cup salsa and cilantro. Add additional salsa if desired. Cover partially while you prepare the salad.
Assemble the Salad
Add the lettuce to serving plates or a large salad bowl. Sprinkle with the meat mixture.
Top with diced tomatoes, peppers, black beans, corn, black olives, onions, and cheese.
Drizzle with salad dressing or serve it on the side.
Sprinkle with tortilla chips and serve!