Peel, core, and dice one medium apple into small pieces, allowing them to sit in a bowl to enhance their flavor.

In a large mixing bowl, whisk together 1 cup of all-purpose flour, 2 teaspoons of baking powder, 1/2 teaspoon of baking soda, 1/4 teaspoon of salt, 1 teaspoon of ground cinnamon, and 2 tablespoons of granulated sugar.

In a separate bowl, combine 3/4 cup of milk, 1 large egg, 1 teaspoon of vanilla extract, and 2 tablespoons of melted unsalted butter. Whisk until smooth.

Gradually fold the wet ingredients into the dry mixture using a spatula, then gently fold in the diced apple pieces.

Preheat a non-stick skillet or griddle over medium heat and lightly grease it. Pour about 1/4 cup of batter for each pancake. Cook until bubbles appear, then flip and cook until golden brown.

Remove pancakes from the skillet and stack on a warm plate. Drizzle with a glaze made of powdered sugar, milk, and vanilla extract, and sprinkle additional cinnamon if desired.