1 1/4 cups all-purpose flour
1 teaspoon baking powder
1/4 teaspoon salt
2 very ripe bananas, mashed (3/4 cup)
1 stick (1/2 cup) unsalted butter, melted
2/3 cup sugar
1 large egg
1/2 teaspoon vanilla
3/4 cup sweetened flaked coconut
Special equipment: a muffin tin with 8 (1/2-cup) muffin cups; paper liners
Put oven rack in middle position and preheat oven to 375°F. Line muffin cups with liners.
Whisk together flour, baking powder, and salt in a bowl. Whisk together bananas, butter, sugar, egg, vanilla, and 1/2 cup coconut in a large bowl until combined well, then fold in flour mixture until flour is just moistened.
Bake until muffins are puffed and golden, about 25 minutes. Transfer muffins to a rack and cool slightly.