1 (9 inch) unbaked pie shell
1/2 lb. ground beef
1/2 c. mayonnaise
1/2 c. milk
2 eggs
1 tbsp. cornstarch
1/2 lb. Swiss cheese
1/2 lb. Cheddar cheese
1/2 c. diced onion

Brown meat. Blend in mayonnaise, milk, eggs and cornstarch. Stir in cheese and onion. Pour into pie shell. Bake 350 degrees, 35-40 minutes. Serves 6.