In a large skillet over medium-high heat, cook the ground beef until no longer pink, about 5-7 minutes. Drain the beef and set aside.
2
In the same skillet, sauté the chopped red onion and minced garlic until fragrant and softened, about 3-4 minutes.
3
Add the cooked ground beef back to the skillet, along with the green chilis, black beans, taco seasoning, and taco sauce. Stir to combine and cook for an additional 2 minutes.
4
Add the corn tortilla pieces and 1 cup of grated cheddar cheese to the skillet, stirring well to incorporate. Cook until the cheese is melted and the mixture is heated through.
5
Top the skillet with the remaining 1 cup of grated cheddar cheese and dollop of sour cream. Stir gently to combine.
6
Garnish the skillet with pico de gallo and chopped cilantro before serving.