French Fried Onion Rings
["1 c. flour", "1 tsp. baking powder", "1/2 tsp. salt", "1 egg", "1 c. milk", "1/4 c. oil"]
["For thicker batter:", "Increase salt to 1 teaspoon; add another egg.", "Reduce milk to 1/2 cup and reduce oil to 1 teaspoon."]
["flour", "baking powder", "salt", "egg", "milk", "oil"]