Ultimate Peanut Butter and Nutella Sandwich Cookies
First, preheat oven to 350° F. Place butter and sugars in large bowl and beat for several minutes until fluffy and pale in color. Add peanut butter and beat for a few more seconds until combined. Add eggs and vanilla and beat until combined.
In another bowl, sift flour, baking soda, baking powder, and salt. Add flour mixture to wet mixture and, using a rubber spatula, gently fold to combine. Roll dough into 1-inch balls and place on non-stick cookie sheet. With a fork, make a grid pattern on cookies. Bake for 8–9 minutes. Let cookies cool on sheet for a few minutes before transferring to wire rack to cool completely.
For Nutella filling, place cream cheese, marshmallow cream, and Nutella in bowl and beat until combined. Spread filling on bottom side of one cookie and place another cookie on top.