1/2 c. mayonnaise
2 tbsp. plain flour
4 eggs, beaten
1/2 c. milk
4 oz. sharp Cheddar cheese, grated
4 oz. Swiss cheese, grated
1 (6 3/4 oz.) tuna fish
1 9" deep pie shell

Combine mayonnaise, flour, egg and milk. Add cheeses and tuna fish. Pour mixture into pie shell and bake in a 350 degree oven for 40-45 minutes.