Heat the olive oil in a pan over medium heat. Add the onion and garlic and sauté until softened.
Add the ground beef and cook until it browns. Season with taco seasoning, salt, and black pepper, and mix well.
Let the meat cook over low heat until fully done.
Toast the tortilla breads in the oven in a deep bowl so they form a bowl shape.
In the toasted tortilla bowls, place the chopped lettuce, bell pepper, avocado, cherry tomatoes, cheese, red onion, and cilantro. Add the cooked ground beef on top.
In a small bowl, whisk together the olive oil, lemon juice, salt, and black pepper. Drizzle the dressing over the salad and toss gently.
Serve the Keto Taco Salad immediately.