Preheat the oven to 375°F (190°C) and line a muffin tin with paper liners.
In a large bowl, whisk together the flour, granulated sugar, brown sugar, baking powder, and salt.
In another bowl, combine the melted butter, milk, egg, and vanilla extract.
Pour the wet ingredients into the dry ingredients and mix until just combined.
Divide the batter evenly among the muffin cups.
Generously sprinkle the cinnamon sugar over the tops of the muffins.
Bake for 18-20 minutes, or until a toothpick inserted into the center comes out clean.
Allow the muffins to cool in the tin for 5 minutes before transferring them to a wire rack to cool completely.
Prep Time: 10 minutes | Cooking Time: 20 minutes | Total Time: 30 minutes | Kcal: 210 kcal | Servings: 12 muffins
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