From Epicurious. I had cut back on the sugar and left out the coconut topping but afterwards wished I hadn't. Oddly, a pool of butter sat in the muffin tins after baking, but I transferred the muffins to a new plate and it appeared to be fine.
1 1/4 cups all-purpose flour
1 teaspoon baking powder1/4 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
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.
Divide batter among lined muffin cups and sprinkle with remaining 1/4 cup coconut. Bake until muffins are puffed and golden, about 25 minutes. Transfer muffins to a rack and cool slightly.