1. In a large bowl, whisk together the all-purpose flour, baking powder, baking soda, salt, cinnamon, and granulated sugar. In a separate bowl, whisk together the milk, egg, vanilla extract, and melted butter. Pour the wet ingredients into the dry ingredients and stir until just combined. Gently fold in the diced apples, being careful not to overmix the batter.

2. Heat a griddle or large skillet over medium heat and lightly grease it with butter or cooking spray. Pour 1/4 cup of the batter onto the hot surface for each pancake. Cook until bubbles form on the surface and the edges look set, about 2-3 minutes. Flip the pancakes and cook for an additional 2-3 minutes, or until golden brown and cooked through. Remove the pancakes from the griddle and keep them warm while you prepare the glaze.

3. In a small bowl, whisk together the powdered sugar, milk, vanilla extract, and cinnamon (if using) until the mixture is smooth and pourable.

4. Drizzle the delectable glaze over the warm Apple Fritter Pancakes and serve immediately. Savor the perfect balance of fluffy pancakes, sweet apples, and the irresistible cinnamon-sugar glaze in every bite.