In a large mixing bowl, whisk together flour, baking powder, sugar, and salt. In another bowl, combine milk, egg, and vanilla extract. Pour the wet ingredients into the dry ingredients and stir until just combined. Stir in melted butter.

Prepare the Cinnamon Slurry

In a small bowl, mix together brown sugar, ground cinnamon, and softened butter until well combined.

Cook the Pancakes

Heat a non-stick skillet over medium heat. Pour 1/4 cup of pancake batter onto the skillet, then swirl a spoonful of cinnamon slurry on top. Cook until bubbles form, then flip and cook until golden brown on the other side.

Royal Icing Preparation

Make the Royal Icing

In a mixing bowl, beat together powdered sugar, egg white (or meringue powder), and water until smooth and glossy. Adjust consistency with more water if needed.

Cinnamon Butter Preparation

Make the Cinnamon Butter

In a small bowl, mix together softened butter, ground cinnamon, and honey until smooth and well combined.