1Heat oven to 400ºF. Grease bottoms only of 12 regular-size muffin cups with shortening or cooking spray, or place paper baking cup in each muffin cup.
2In large bowl, beat bananas, brown sugar, milk, oil and egg with electric mixer on medium speed, or mix with spoon. Stir in flour, baking powder and salt just until flour is moistened. Fold miniature chocolate chips into batter.
3Divide batter evenly among muffin cups; sprinkle each with 1/2 teaspoon sugar. Bake 13 to 18 minutes or until toothpick inserted in center comes out clean. Immediately remove from pan.