Preheat oven to 400ºF.
Combine cereal and milk; let stand 3 minutes.
Meanwhile, mix flour, baking powder, cinnamon and salt in large bowl; set aside.
Mix together egg, yogurt, oil, and brown sugar and mix well. Stir into cereal mixture until well blended. Add all to flour mixture; stir just until moistened. (Batter will be lumpy.)
Spoon evenly into 12 muffin cups sprayed with non stick cooking spray, filling each cup two-thirds full.
Bake for 20 minutes or until toothpick inserted in centers comes out clean.
Cool in pan for 5 minutes before removing to a wire rack. Serve warm.