Mix dry ingredients: In a bowl, combine flour, sugar, baking powder, cinnamon, and salt.
Mix wet ingredients: In another bowl, whisk milk, egg, melted butter, and vanilla extract (if using).
Combine: Mix the wet mixture with dry ingredients by adding the wet mixture to the ingredients. Stir until just combined.
Add apples: Fold in the grated or chopped apple.
Preheat pan: Use stickiness proof pan and heat it over a medium heat. Use butter or oil to grease.
Cook pancakes: Pour about 1/4 cup of batter in the pan to make one pancake. Cook until it becomes bubbly form, after that you flip until golden brown.
Serve: Top with maple syrup, butter, or your favorite toppings.