In medium bowl stir together flour, sugar, baking powder, baking soda and salt. Set aside.
In large bowl combine milk, KELLOGGS ALL-BRAN Original cereal and oats. Let stand about 2 minutes. Add egg, banana, almond butter, cinnamon and nutmeg. Beat well. Add flour mixture and chocolate morsels, stirring until just combined. Portion evenly into eighteen 2 1/2-inch muffin-pan cups coated with cooking spray or lined with foil bake cups.
Bake at 375°F for 16 to 18 minutes or until a toothpick inserted in center comes out clean. Let stand in pan for 5 minutes. Transfer to wire rack. Serve warm.