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This is called Impossible Cheeseburger Pie because the pie does the impossible by making its own crust. Nice alternative for folks who don't own a grill. Impossible Cheeseburger Pie Vintage recipe from 1981 Bisquick advertising 1 lb. ground beef 1 1/2 cups chopped onion 1/2 tsp. salt 1/4 tsp. pepper...