Preheat oven to 350.
Brown beef with onions.
Crush doritos and sprinkle in bottom of casserole dish.
Place meat on top of chips
Sprinkle with cheese
In a sauce pan mix soup and rotel. Bring to a boil. Pour on to cheese
Add corn (and mushrooms if desired) to soup mix
Sprinkle top with crushed Doritos.
Bake at 350 for 20 minutes or until chips are browned
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