In a 10" skillet or saute pan, cook ground beef on medium-high. Chop and stir so that beef becomes crumbly. Cook thoroughly, (about 10 minutes) then add 1/2 cup red onion and cook until tender (about 3 minutes).
Add black beans, taco seasoning, and water. Stir so that seasoning mix has evenly coated the mixture.
Remove from heat. Stir in half the cheese. Bake for 15 minutes.
Sprinkle remaining cheese over top and bake for 10 minutes, or until cheese is melted. Let cool 5 minutes.
Sprinkle evenly with tomatoes, green onion, cilantro, and remaining red onion.
Serve warm with chips, sour cream, and/or guacamole. Enjoy!
Notes
Recipe can easily be doubled, cook in a 12" skillet.