Preheat oven to 400°.
Combine cereal and milk in a bowl; stir well, and let stand 5 minutes.
Lightly spoon flour into dry measuring cup; level with a knife. Stir together flour and next 7 ingredients in a large bowl. Add sweet potato and next 3 ingredients to cereal mixture; stir well. Add to dry ingredients, stirring just until moist. Stir in raisins.
Spoon batter into 12 muffin pans coated with cooking spray, filling three-fourths full. Bake at 400° for 25 minutes or until golden. Remove from pans immediately, and place on a wire rack.