Pumpkin Coffee Cake Muffins

Bahan-bahan (12 porsi)

• ⅔ cup all purpose flour
• ½ cup finely chopped pecans
• ⅓ cup granulated white sugar
• ¼ cup packed dark brown sugar
• 1 teaspoon ground cinnamon
• 4 tablespoons (½ stick) unsalted butter, (divided)
• 1⅓ cups all purpose flour
• ⅔ cup granulated white sugar
• 1 teaspoon salt
• 6 tablespoons (¾ stick) unsalted butter, (at room temperature)
• 1½ teaspoons baking powder
• ¼ teaspoon baking soda
• ¼ teaspoon ground nutmeg
• ½ cup sour cream
• 1 large egg
• 1 teaspoon vanilla extract
• ¾ cup canned unsweetened pumpkin puree
• 1 cup powdered sugar
• 3 tablespoons milk
• ½ teaspoon vanilla extract