Preheat oven to 375 degrees.

To a large skillet over medium-high heat, add onions, ground beef and 2 tablespoons of taco seasoning. Cook until no longer pink. Drain grease from the skillet. Add salt for flavor if desired. (6 minutes)

Stir in corn and pinto beans. Pour the mixture into a greased 11x7 baking dish. 

Lightly crush the Doritos (you want chunks of chips). Layer Doritos, cheese, olives and green onions over the meat mixture.

Bake in the preheated 375 degree oven for 35 minutes. If it begins to brown too quickly, tent with foil.

Cool slightly, then serve, topped with shredded lettuce, tomatoes, and sour cream.