Brownies Roti Pisang

Bahan-bahan (16 porsi)

• ¾ cup mentega tawar
• 1 cup gula pasir
• ½ cup gula merah
• 3 large telur
• 2 teaspoons ekstrak vanila
• ¾ cup all-purpose flour
• ½ teaspoon garam
• 1 cup over-ripe mashed bananas ((about 2 medium bananas))
• ½ teaspoon baking powder
• ½ cup bubuk kakao tanpa pemanis
• ¾ cup keping coklat setengah manis
• 2 tablespoons keping coklat setengah manis, (untuk taburan)