1. Stir together flour, baking powder, salt, cinnamon, and sugar. Set aside.
2. Measure KELLOGG'S ALL-BRAN COMPLETE Wheat Flakes cereal and milk into large mixing bowl. Stir to combine. Let stand 2 minutes or until cereal is softened. Add egg whites and oil. Beat well. Add flour mixture, stirring only until combined. Gently stir in blueberries. Spoon batter evenly into twelve 2 1/2-inch muffin-pan cups coated with cooking spray.
3. Bake at 400° F about 23 minutes or until light golden brown. Serve warm.