Preheat oven to 350.
Brown ground beef and onion;drain.
Stir in taco seasoning and tomato sauce;mix well.
Unroll crescent roll dough;press onto bottom and up side of 9 in pie pan.
Press to seal perforations.
Sprinkle crust with 3/4 cup crushed chips.
Spread beef mixture over chips.
Bake 15 minutes.
Add sour cream then cheese and top with remaining chips.
Bake 15 minutes longer or until crust is brown.
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