Prepare the oven by preheating it to 350 degrees.
Take a large pan and heat olive oil in it over medium-high flame.
Pour onion in it and a hint of pepper and salt for taste. Keep cooking it for 4 minutes, and stir frequently.
Add chili powder, garlic, paprika, cumin, dried oregano, garlic powder, a hint of pepper and salt. Cook it for 30 seconds and stir it at constant regular intervals.
After that, mix raw ground beef in it and again cook. Break it into small pieces by using a spatula, cook it wholly. Stir in black beans and salsa.
Drizzle up cheese, cover-up taco meat and bake it in the oven. Keep it uncovered for about 5 minutes, or to the point whole cheese is completely melt.
Drizzle up a layer of Fritos chips and a layer of tomatoes and lettuce.
Garnish the casserole with sour cream, and serve while warm.