Brown 2 lbs of hamburger add onions an cook until onions are tender an hamburger is done. In casserole dish layer crushed dorito chips, hamburger, black beans, corn, refried beans, salsa, shredded cheese, black olives, top with cheese bake at 375 for 25-30 minutes until cheese is melted, top with more doritos an bake another 10-15 minutes, remove from oven cut into squares top with sour cream lettuce an taco sauce. Yum!!