Cinnamon Sugar Donut Muffins

Ingredients

• ½ cup (113g) unsalted butter
• ¾ cup (150g) granulated sugar
• 1 large egg + 1 large yolk
• 2 teaspoons (8g) vanilla extract
• ½ teaspoon vanilla bean paste or seeds from 1 vanilla bean
• 2⅓ cup (302g) all-purpose flour
• 1 Tablespoon (13g) baking powder
• ½ teaspoon salt
• 2 teaspoons cinnamon
• ½ teaspoon nutmeg
• 1 cup (230g) whole milk
• 1 cup (200g) granulated sugar
• 1 Tablespoon cinnamon