Cinnamon Filling:

1. In a medium bowl, combine the melted butter, brown sugar, and cinnamon. Mix well.
2. Transfer the mixture to a zip-top bag and set aside.

Cream Cheese Glaze:

1. In a small saucepan over low heat, melt the butter.
2. Remove from heat and whisk in the cream cheese, powdered sugar, and vanilla extract until smooth. Set aside.

Pancakes:

1. In a medium bowl, whisk together the flour, baking powder, and salt.
2. In a separate bowl, whisk together the milk, egg, and oil. 3. ¹ Pour the wet ingredients into the dry ingredients and mix until just combined.  
3. Heat a skillet or griddle over medium-low heat. Spray with non-stick cooking spray.
4. Pour about ½ cup of batter onto the hot skillet.
5. Once bubbles start to form on the surface of the pancake, snip the corner of the zip-top bag containing the cinnamon filling. Create a swirl pattern in the center of the pancake, being careful not to get too close to the edge.
6. Using a wide metal spatula, flip the pancake and cook for an additional 1-2 minutes, or until golden brown.
7. Wipe the skillet clean between batches and repeat with the remaining batter.
8. Warm the cream cheese glaze if needed and drizzle over the cooked pancakes.