
Ingredients:
For The Muffin:
- ½ cup softened unsalted butter
 - ⅔ cup granulated sugar
 - 1 large egg
 - 1 ½ teaspoons vanilla extract
 - ½ cup milk
 - ¼ cup sour cream
 - 1 ⅔ cups all-purpose flour
 - 1 ½ 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
 
Instructions:
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