Heat oven to 400 degrees F. Place paper baking cup in each of 12 regular size muffin cups, or grease bottoms only of muffin cups.
Beat egg in large bowl; stir in remaining ingredients, except blueberries, just until flour is moistened (batter will be lumpy). Gently stir in blueberries. Divide batter evenly among muffin cups.
Bake 20 - 30 minutes or until golden brown. Immediately remove from pan. Serve warm.