Prepare Cinnamon Filling: In a small mixing bowl, combine melted butter, brown sugar, and ground cinnamon until fully blended. Pour mixture into a ziplock bag, sealing it tightly. Set aside for about 10 minutes.

Make Pancake Batter: In a larger bowl, whisk together flour, baking powder, and salt. Create a well in the center and add milk, vegetable oil, and beaten egg. Mix until just combined, lumps are okay.

Prepare Glaze: In a microwave-safe bowl, place cream cheese and additional melted butter. Heat for about 30 seconds, then whisk until smooth. Gradually stir in powdered sugar and vanilla, mixing until velvety.

Cook Pancakes: Preheat a non-stick skillet over low to medium heat. Pour ½ cup of batter onto skillet, immediately pipe a swirl of cinnamon filling on top. Cook until bubbles appear, about 2-3 minutes. Flip and cook until golden brown.

Serve: Stack pancakes on a plate and drizzle generously with cream cheese glaze. Optional toppings include powdered sugar or chopped nuts.