1. In a large bowl, whisk together the dry ingredients: flour, baking powder, baking soda, salt, cinnamon, and sugar. In a separate bowl, whisk together the wet ingredients: milk, egg, vanilla extract, and melted butter. Gently pour the wet ingredients into the dry ingredients and stir until just combined, leaving some small lumps in the batter. Fold in the diced apple pieces, being careful not to overmix.

2. Preheat a griddle or large skillet over medium heat and lightly grease it with butter or cooking spray. Pour 1/4 cup of the prepared batter onto the hot surface for each pancake. Cook the pancakes 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 they are golden brown and cooked through. Transfer the cooked pancakes to a plate and keep them warm while you finish cooking the remaining batter.

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 warm cinnamon-vanilla glaze over the freshly cooked Apple Fritter Pancakes and serve immediately. Savor the delightful combination of fluffy pancakes, apple-cinnamon goodness, and the irresistible glaze.