Bring milk to a boil in a large saucepan; remove from heat, and stir in O-shaped cereal. Let stand 5 minutes or until cereal is softened.
Stir in apple and next 8 ingredients until blended.
Place paper baking cups in muffin pans, and lightly coat with cooking spray. Spoon batter evenly into cups.
Bake at 375° for 18 to 20 minutes or until a wooden pick inserted in center comes out clean.
Note: For testing purposes only, we used Cracklin' Oat Bran Cereal for sweetened cereal and Hodgson Mill Oat Bran Hot Cereal for uncooked cereal in this recipe.