Coat a baking sheet with cooking spray. Using your finger, draw 4 (5-inch) circles on baking sheet. Spoon 1 tablespoon batter onto each circle, spreading to edges of circle using the back of a spoon. Bake at 400° for 6 minutes or until edges begin to brown.
Loosen edges with a spatula; remove from baking sheet. Working quickly, gently drape each taco over suspended wooden spoons, gently shaping into a shell; cool completely. (Shells are delicate and should be handled carefully when shaped.) Repeat procedure to form a total of 8 shells.