Creating these Cinnamon Roll Cupcakes is straightforward and fun! Follow these easy steps to achieve cupcake perfection:

1. Preheat Oven: Preheat your oven to 350°F (175°C) and prepare a standard cupcake pan by lining it with paper cupcake liners.
2. Mix Dry Ingredients: In a large bowl, combine the flour, granulated sugar, baking powder, salt, and cinnamon. Whisk until well blended.
3. Combine Wet Ingredients: In another bowl, mix the melted butter, milk, eggs, and vanilla extract until fully combined.
4. Combine Mixtures: Gradually add the wet ingredients to the dry ingredients, stirring until you create a smooth batter. Avoid overmixing.
5. Prepare Cinnamon Filling: In a small bowl, mix together the brown sugar, cinnamon, and softened butter to create a paste-like consistency.
6. Fill Cupcake Liners: Spoon the batter into each cupcake liner, filling them about halfway full. Add a small dollop of the cinnamon filling on top of the batter, followed by another spoonful of batter to cover the filling.
7. Swirl the Filling: Use a toothpick or a small knife to gently swirl the cinnamon filling into the batter, creating a marbled effect. Be careful not to stir too much.
8. Bake Cupcakes: Place the cupcake pan in the preheated oven and bake for 20-25 minutes, or until a toothpick inserted in the center comes out clean.
9. Cool: Once baked, remove the cupcakes from the oven and allow them to cool in the pan for about 5 minutes. Then, transfer them to a wire rack to cool completely.
10. Prepare Icing: While the cupcakes cool, mix the powdered sugar, cream cheese, milk, and vanilla extract in a bowl until smooth and creamy. Adjust the consistency by adding more milk if necessary.
11. Drizzle Icing: Once the cupcakes have completely cooled, drizzle the icing over the top of each cupcake using a spoon or a piping bag.