Preheat oven to 375 degrees. Place liners in muffin tin or grease muffin tin well. In a large bowl, whisk together the first five dry ingredients (flour, sugar, baking soda, salt, baking powder). In a medium bowl, whisk together all wet ingredients (eggs, melted butter, and vanilla extract).
Add the wet ingredients to the flour mixture, stirring just until combined (the batter will be stiff).
Fold in the peeled/chopped apples.
Spoon the muffin batter into the prepared muffin tin, filling each cup 3/4’s of the way full.