Banana Nut Crunch Muffins

Bahan-bahan (12 porsi)

• 1 ½ cups all-purpose flour
• ½ teaspoon cinnamon
• 1 teaspoon baking powder
• 1 teaspoon baking soda
• ¼ teaspoon salt
• 3 bananas (ripe and mashed)
• ⅔ cup granulated sugar
• 1 egg
• 1 teaspoon vanilla extract
• ½ cup melted butter
• ⅓ cup brown sugar (packed)
• 2 tablespoons all-purpose flour
• 2 tablespoons butter
• 2 tablespoons oats
• ⅓ cup chopped pecans