Banana Coffee Cake with Streusel Topping

Bahan-bahan (9 porsi)

• ¾ cup sugar
• ½ cup (1 stick) butter, (melted)
• 2 large eggs
• ¼ cup sour cream or plain yogurt
• 1 cup mashed banana
• 1½ cups all purpose flour
• 1 teaspoon baking powder
• 1 teaspoon baking soda
• 1 teaspoon vanilla extract
• ⅓ cup all purpose flour
• ¼ cup (½ stick) butter, (at room temperature)
• ¼ cup granulated white sugar
• ¼ cup light brown sugar
• ½ teaspoon ground cinnamon
• ¼ teaspoon ground nutmeg