See the Supply List for additional tool items you can purchase here.
Preheat oven to 375°F. Prepare muffin pan with vegetable pan spray.
In small bowl, combine cereal with brown sugar and butter to make the topping. Set aside.
For muffins, combine flour, cornmeal, baking powder and salt in medium bowl.
In large bowl, beat butter, granulated sugar, egg and vanilla with electric mixer until light and fluffy. Alternately add flour mixture and milk to butter mixture; mix well. Gently fold in blueberries. Divide evenly into prepared muffin pan. Press topping evenly onto muffins.
Bake 19-21 minutes or until toothpick inserted in center comes out clean. Remove to wire rack and let cool slightly. Serve warm or at room temperature.