Banana cake with rum icing

For cake
1 stick (1/2 cup) unsalted butter, softened, plus additional for greasing pan
1 1/2 cups all-purpose flour plus additional for dusting pan
1 1/2 teaspoons baking powder
1/2 teaspoon baking soda
1/2 teaspoon salt
3/4 cup packed light brown sugar
1 large egg
3/4 cup well-mashed very ripe bananas
1/4 cup sour cream
1/2 teaspoon vanilla

For the frosting
1/2 stick (1/4 cup) unsalted butter, softened
1 tablespoon light or golden rum
1/4 teaspoon salt
2/3 cup confectioners’ sugar

Put oven rack in middle position and preheat oven to 350°F.
Lightly butter and flour a 9-inch round cake pan, knocking out excess flour.
Whisk together flour (1 1/2 cups), baking powder, baking soda, and salt in a small bowl.
Beat together butter (1 stick) and brown sugar in a large bowl with an electric mixer at high speed until pale and fluffy. Beat in egg until combined, then add bananas, sour cream, and vanilla and beat until combined well. Reduce speed to low and add flour mixture, mixing until just incorporated.
Spread batter in cake pan and bake until pale golden and a wooden pick or skewer inserted in center comes out clean, 20 to 25 minutes.
Cool in pan on a rack 10 minutes. Run a thin knife around edge of pan, then invert rack over cake and invert cake onto rack to cool completely.

Icing


In a bowl with an electric mixer cream the butter, add the rum, the salt, and the confectioners’ sugar, and beat the frosting until it is light and fluffy.


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