Roti Pisang Basah (Roti Pisang Rum)

Bahan-bahan (10 porsi)

• 4 American bananas (overripe, mashed )
• 1 2/3 cups all-purpose flour
• 2 teaspoons baking powder
• 1/2 teaspoon baking soda
• 1/2 teaspoon salt
• 1/2 cup butter (melted)
• 2 tablespoons sour cream (or plain yogurt)
• 2/3 cups brown sugar
• 2 large eggs
• 1/3 cup walnuts
• 2 1/2 tablespoons dark rum
• 1 teaspoon vanilla extract