Peanut Butter Oatmeal Cookies with Nutella Buttercream Filling

Cookie Ingredients:

1/2 cup unsalted butter, softened
1/2 cup peanut butter
1/2 cup white sugar
1/2 cup brown sugar
1 egg
1 tsp pure vanilla extract
3/4 cup flour
1/2 tsp baking soda
1/2 tsp salt
1/4 tsp baking powder
1 cup Old Fashioned Oats

Preheat oven to 350 degrees.  Spray two baking sheets with non-stick cooking spray or line with parchment paper.

In a large stand mixer, cream together the butter and peanut butter.  Add the white sugar, brown sugar, egg, and vanilla extract and beat until combined.  Add the flour, baking soda, salt, and baking powder and mix just until incorporated.  Add the Oats and mix.

Roll into balls and place on prepared baking sheets (dough will be slightly sticky).  Flatten with a fork like you would for peanut butter cookies.  Bake for 8-10 minutes, or until edges are light golden brown. (Baking time depends on cookie size)  Leave on hot baking sheets for 1 minute, then remove to wire cooling rack.  You can make the filling while cookies are cooling.

Original recipe with teaspoon size cookie dough makes 15 sandwich cookies.
Large cookies as shown makes 11 sandwich cookies.

Nutella Buttercream Filling:

1 stick unsalted butter, softened
1/2 cup Nutella
1 tsp pure vanilla extract
2 cups powdered sugar
milk, as needed

In a stand mixer, cream together the butter, Nutella, and vanilla.  Add the powdered sugar, then slowly add milk as needed for thick filling consistency.  Beat until thick frosting forms, about 4 minutes.

When the cookies have cooled, pipe or spread filling on the inside of 1/2 of the cookies.  Place another cookie on top of filling to create sandwich.  Repeat with all cookies.  Enjoy!