Heat a deep skillet over medium heat. Add the vegetable oil and ground beef. Sauté the beef, breaking it into crumbles as you go, until fully browned. Drain the excess fat if needed.

Add the chili powder, cumin, oregano, garlic powder, cayenne pepper, and salt to the skillet. Drain, but do not rinse, the black beans and then add them to the skillet. Stir until the beef and beans are coated in the spices. Continue to sauté until heated through (3-5 minutes).

Spread the corn kernels and shredded cheese over the beef and bean mixture. Place a lid on the skillet and let the mixture warm through until the cheese is melted (about 5 minutes).

Meanwhile, dice the tomato, slice the green onions, and shred the lettuce.

Once the cheese is melted, turn off the heat. Top the skillet with the broken tortilla chips, lettuce, tomato, and green onion.

Scoop the layered salad into each of four bowls, then add a dollop of sour cream to each serving.