Coarsely chop lettuce, halve cherry tomatoes and pit, peel and slice avocados. Set aside.

In large frying pan over medium-high heat, heat olive oil. Brown ground beef, stirring occasionally, 4-5 minutes. Add taco seasoning and water; cook according to package directions, 5-8 minutes, or until meat is thoroughly cooked.

Drain and rinse black beans. Set aside.

Divide lettuce among serving bowls or plates. Top with ground beef, tomatoes, avocados, black beans, corn, cheese and 2 tablespoons cilantro. Tuck in tortilla chips.

Drizzle with southwest ranch dressing and sprinkle with additional cilantro, if desired.