Heat a large sauté pan over medium high heat, add oil and sauté onions and garlic for 3 minutes.
Add ground beef using a wooden spoon to break up the pieces and cook for 3 minutes.
Add bell pepper, taco seasoning, salt and sauté for 2-3 minutes or until beef is cooked through. Add cilantro and lime juice and set aside.
To assemble, divide the lettuce between individual serving bowls, top with beef mixture, black beans, cheese, chopped tomatoes and chips.
Top with sour cream, salsa, guacamole and/or your favorite hot sauce. Alternatively you can place all of the ingredients in separate bowls for a fun DIY meal!