In a large skillet, cook beef until it is no longer pink. Drain fat. Reduce heat to low and add taco seasoning and a half a cup of water. (I sometimes add a little bit of salsa and fresh cilantro to my meat as well.)
Smash avocado in a small bowl with the lime juice and salt and garlic powder, to taste. Mix well.
Assemble lettuce in bowls or plates. Top with the seasoned beef as well as the beans, corn, tomatoes, smashed avocado, cheese, sour cream, salsa and fresh cilantro. Garnish with tortilla chips, avocado lime ranch and fresh lime wedges.