banana and coconut cake

Ingredients

• 3/4 cup butter, softened
• 1 1/2 cups sugar
• 2 - eggs
• 1 cup mashed banana
• 2 cups cake flour
• 1 teaspoon baking powdwe
• 1 teaspoon baking soda
• 1/2 cup buttermilk
• 1/2 cup chopped pecans{optional}
• - frosting
• 1 cup butter
• 2 cups confectioners' sugar
• 1 teaspoon vanilla
• 1/2 cup evaporated milk or heavy cream