01 - Preheat the oven to 375°F. Line a 12-cup muffin pan with paper liners or lightly grease each cup.
02 - In a large mixing bowl, whisk together the all-purpose flour, baking powder, baking soda, ground cinnamon, and salt until thoroughly blended.
03 - In a separate bowl, whisk the eggs, maple syrup, melted butter, milk, and vanilla extract until cohesive.
04 - Add the wet ingredient mixture to the dry ingredients. Stir gently just until combined; avoid overmixing.
05 - Gently fold the diced apples into the batter, distributing evenly.
06 - Divide the batter equally among the prepared muffin tin wells, filling each approximately three-quarters full.
07 - Bake for 18-22 minutes, or until a toothpick inserted into the center of a muffin emerges clean. Cool muffins in the pan for five minutes before transferring to a wire rack to cool completely.