Preheat an oven to 375 F.

Prepare a muffin pan by lining with muffin papers or spraying with nonstick baking spray.

In a medium sized mixing bowl, whisk together the flour, oats, pie spice, baking powder, baking soda, and salt. Set aside.

In a large mixing bowl, whisk together the applesauce, both sugars, discard, melted butter, eggs, and vanilla extract until well combined.

Gently fold in the flour mixture into the wet ingredients, until just combined, without over-mixing. 

Divide evenly into the 12 prepared muffin pans - each muffin well should be fairly full. 

Bake for 15-20 minutes, or until a toothpick inserted into the center comes out clean.

Allow the muffins to cool in the pan for 5-10 minutes before removing to a wire rack to cool completely.