In a large mixing bowl, whisk together flour, baking powder, cinnamon, nutmeg, salt, and sugar until well combined.

In a separate bowl, beat the egg, then add milk, melted butter, and vanilla extract. Whisk until smooth.

Pour the wet ingredients into the flour mixture and gently fold them together with a spatula until combined.

Dice the apple and fold it gently into the pancake batter, ensuring even distribution.

Allow the batter to rest for 5-10 minutes.

Preheat a non-stick griddle over medium heat and lightly grease the surface.

Pour ¼ cup of batter onto the griddle for each pancake and listen for a sizzle.

Cook for 2-3 minutes, watching for bubbles to form, then flip the pancakes and cook another 2-3 minutes.

Keep pancakes warm in a preheated oven at 200°F if making multiple.