1. In a large bowl, whisk together the flour, sugar, baking powder, baking soda, and salt.

2. In another bowl, mix the buttermilk, egg, and melted butter until combined.

3. Pour the wet ingredients into the dry ingredients and mix until just combined.

4. In a small bowl, combine the brown sugar and cinnamon to create the filling.

5. Heat a non-stick skillet over medium heat and pour 1/4 cup of pancake batter onto the skillet.

6. Sprinkle a teaspoon of the cinnamon filling mixture over the pancake and use a knife to swirl it gently.

7. Cook until bubbles form on the surface, then flip and cook until golden brown.

8. For the frosting, beat together the cream cheese, powdered sugar, and milk until smooth.

9. Serve the pancakes warm, drizzled with cream cheese frosting.