Kue Pisang Mentega Kecokelatan dengan Frosting Gula Merah

Bahan-bahan (12 porsi)

• 3 tablespoons mentega tawar
• ¾ cup brown sugar, (packed)
• ¼ cup Sayang
• 3 medium pisang yang sangat matang (kupas dan tumbuk)
• 1 teaspoon vanila
• ½ cup + 2 tablespoons buttermilk
• 2 eggs, (slightly beaten)
• 3 tablespoons minyak sayur
• 2 cups all-purpose flour
• ½ teaspoon garam
• ¾ teaspoon soda kue
• 2 cups gula bubuk
• ⅓ cup brown sugar, (packed)
• 2 tablespoons unsalted butter, (softened)
• 3 -4 tablespoons milk
• ½ teaspoon vanila