Creating these Cinnamon Roll Cupcakes is both fun and rewarding. Follow these steps to ensure your baking success:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Line a muffin tin with cupcake liners.

2. Make the Cupcake Batter: In a large mixing bowl, cream together the softened butter and granulated sugar until light and fluffy. Add the eggs one at a time, mixing well after each addition. Then, stir in the milk and vanilla extract.

3. Combine Dry Ingredients: In a separate bowl, whisk together the all-purpose flour, baking powder, and salt. Gradually add the dry ingredients to the wet mixture, mixing until just combined.

4. Prepare the Cinnamon Swirl: In a small bowl, combine the brown sugar, ground cinnamon, and melted butter. Mix until well combined and set aside.

5. Fill the Cupcake Liners: Spoon a tablespoon of cupcake batter into each cupcake liner. Then, add a teaspoon of the cinnamon swirl mixture on top of the batter. Finally, add another tablespoon of batter on top, covering the swirl.

6. Swirl the Mixture: Use a toothpick or a skewer to gently swirl the cinnamon filling into the batter for a marbled effect.

7. Bake: Place the muffin tin in the preheated oven and bake for 20-25 minutes or until a toothpick inserted in the center comes out clean.

8. Cool the Cupcakes: Allow the cupcakes to cool in the tin for about 10 minutes. Then, transfer to a wire rack to cool completely.

9. Prepare the Cream Cheese Frosting: In a mixing bowl, beat together the softened cream cheese and butter until smooth. Gradually add the powdered sugar and vanilla extract, mixing well. Add milk as needed to achieve the desired consistency.

10. Frost the Cupcakes: Once the cupcakes are completely cool, generously frost each cupcake with the cream cheese frosting.

11. Add a Final Touch: For an extra special touch, you can sprinkle some cinnamon or drizzle with a little melted butter on top of the frosting.