Heat oven to 375°F. Grease bottoms only of 6 jumbo (3 1/2×1 3/4-inch) muffin cups or 12 regular-size muffin cups with shortening or cooking spray, or line with paper baking cups.
In medium bowl, beat egg slightly. Stir in remaining muffin ingredients except mango just until moistened. Stir in mango. Divide batter evenly among muffin cups.
Bake 25 to 35 minutes or until golden brown.
Meanwhile, in small bowl, mix glaze ingredients until smooth and thin enough to drizzle. Immediately remove muffins from pan to cooling rack. Drizzle glaze over muffins. Serve warm if desired.