Muffin Streusel Roti Pisang

Bahan-bahan (12 porsi)

• 2 cups all-purpose flour
• 1 cup granulated sugar
• 1 teaspoon baking powder
• ½ teaspoon salt
• ½ teaspoon baking soda
• ¼ teaspoon ground cinnamon
• 2 eggs
• 1 cup sour cream
• ¼ cup melted butter
• 2 ripe mashed bananas, (about 1 cup)
• ½ cup chopped pecans or walnuts, (optional)
• ½ cup brown sugar
• 3 tablespoons all-purpose flour
• ¼ teaspoon ground cinnamon
• 4 tablespoons softened butter