Preheat the oven to 350F.
Spray a large cookie sheet with cooking spray and keep aside.
In a bowl, mix together the flours, baking soda, baking powder and salt.
Take another large bowl, beat together butter and brown sugar until creamy.
Add Nutella, applesauce and vanilla extract and beat well.
Add flour mixture and beat until the flour is just incorporated.
Using a table spoon or an ice cream scoop, scoop out dough and place it on the cookie sheet. If using an ice-cream scoop, take about ½ a scoop per cookie. Check notes.
Dampen fingers and lightly shape and flatten the cookies.
Bake for 10-15 minutes until cookies are set. I baked for 15 minutes.
Cool the cookies completely on the cookie sheet and store in an airtight container.