Stir together cereal and milk; let stand 5 minutes.
Combine flour and next 3 ingredients in a large bowl; make a well in center of mixture.
Stir banana and next 3 ingredients into cereal mixture; add to dry ingredients, stirring just until moistened. Spoon into greased muffin pans, filling two-thirds full. Sprinkle Streusel Topping evenly over batter.
Bake at 350° for 25 to 30 minutes. Remove from pans immediately, and cool on wire racks.