01 - Whisk together flour, both sugars, baking powder, baking soda, cinnamon, nutmeg, and salt thoroughly in a large mixing bowl.
02 - In a separate bowl, blend together mashed sweet potato, eggs, milk, vanilla extract, and melted butter until the mixture is smooth and uniform.
03 - Gently fold wet ingredients into the dry mixture. Stir just until the batter comes together, taking care not to overmix; it is normal if some small lumps remain.
04 - Heat a nonstick skillet or griddle over medium heat and lightly brush with melted butter.
05 - For each pancake, pour approximately 1/4 cup of batter onto the hot skillet. Cook until small bubbles appear on the surface and the edges begin to set, around 2 to 3 minutes.
06 - Using a spatula, flip the pancakes and cook for an additional 1 to 2 minutes until golden brown and fully set in the center.
07 - In a small bowl, mix granulated sugar and ground cinnamon until evenly combined.
08 - Sprinkle each pancake with cinnamon sugar immediately after cooking so the topping adheres. Serve warm for best flavor.