Thick and chewy chocolate sandwich cookies with Nutella in the center.
Preheat oven to 325° F Add flour, cocoa powder, and baking powder to a mixing bowl and stir to combine.
In another mixing bowl beat together butter and sugars for 2 minutes until smooth.
Add vanilla and nutella and mix until smooth.
Add half of the flour mixture and mix until combined. Add the milk, mixing until combined. Then add the remaining flour mixture and mix until combined.
Cover well and refrigerate the dough for at least 15 minutes or overnight.
Adapted from Two Peas and Their Pod