Ingredients
For The Muffin
- ½ cup softened unsalted butter
- ⅔ cup granulated sugar
- 1 large egg
- 1½ teaspoons vanilla extract
- ½ cup milk
- ¼ cup sour cream
- 1⅔ cups all-purpose flour
- 1½ teaspoons baking powder
- ¼ teaspoon baking soda
- ½ teaspoon ground cinnamon
- ½ teaspoon salt
For Topping:
- 3 tablespoons melted butter
- ⅓ cup granulated sugar
- 2 teaspoons ground cinnamon
