Oatmeal Peanut Butter Sandwich Cookies

1. Preheat Oven and Cream Ingredients

Preheat your oven to 350°F (180°C) and line a baking sheet with parchment paper. In a large mixing bowl, cream together the unsalted butter, creamy peanut butter, granulated sugar, dark brown sugar, and vanilla extract until the mixture is light and fluffy.

2. Add Egg and Dry Ingredients

Next, add the egg to the creamed mixture and beat well until fully combined. In a separate bowl, whisk together the all-purpose flour, baking soda, baking powder, and sea salt. Gradually add these dry ingredients to the wet mixture, stirring gently to combine.

3. Fold in Oats and Bake

Finally, fold in the quick-cooking oats to complete the cookie dough. Using a teaspoon, drop rounded portions of the dough onto the prepared baking sheet, leaving enough space for the cookies to spread. Bake in the preheated oven for 12 to 15 minutes, or until the edges are golden brown. Remove from the oven and allow the cookies to cool completely on a cooling rack.

4. Prepare the Filling

While the cookies are cooling, prepare the filling. In a medium bowl, use an electric mixer to beat together the room-temperature butter, creamy peanut butter, and confectioners’ sugar until smooth and creamy. If the filling is too soft, refrigerate it for about 30 minutes to firm up.

5. Assemble Sandwich Cookies

Once the cookies are completely cooled, spread a generous amount of the peanut butter filling on the flat side of one cookie and top with another cookie to create a sandwich. Repeat until all cookies are paired.