Preheat oven to 400º.
Prepare donut tins by spraying well with cooking spray.
Set aside.
In a large mixing bowl, combine flour, sugars, baking powder, soda, salt and cinnamon.
Stir well and set aside.
In a separate microwaveable bowl, melt butter.
Add applesauce, buttermilk, vanilla, diced peaches and cinnamon chips.
Whisk well to combine.
Add wet mixture to dry mixture and stir just until moistened.
Transfer ingredients to a glad lock bag (without the “stand and fill” bottom).
Cut off a corner and pipe the donut dough into the donut tins a little over ¾ full.
Bake in preheated oven for about 9-10 minutes or until donuts test done with a toothpick.
Remove from oven and cool for 10 minutes.
Dip top of donuts in bowl with melted butter.
Transfer donut to cinnamon-sugar mixture and dredge buttered donut top into the cinnamon-sugar mixture.
Invert donut and lightly dip in melted butter.
Swirl that side in the Cinnamon-sugar mixture.
Continue sprinkling cinnamon-sugar mixture over each side of the donut and gently press the mixture into each side of the donuts.
(I just used my fingers to do this).
Keep flipping the donuts over and pressing more and more of the cinnamon-sugar mixture into each side of the donuts each time.
Do this a total of four times (for the top and four times for the bottom), until the mixture adheres well and the donuts are really well covered with the cinnamon-sugar mixture.
Place on wire racks to cool completely.