Snickerdoodle Muffins

Bahan-bahan (24 porsi)

• 6 tablespoons butter, (at room temperature)
• 1/2 cup granulated white sugar
• 1 large egg
• 1/2 cup milk
• 1 teaspoon vanilla extract
• 1½ cups all purpose flour
• 1½ teaspoons baking powder
• 3/4 teaspoon cream of tartar
• 1/4 teaspoon salt
• 1/2 teaspoon cinnamon
• 1/3 cup granulated white sugar
• 1 teaspoon cinnamon
• 2 tablespoons butter, (melted)