Peanut Butter Cookie Sandwiches

5 from 5 votes

Chewy peanut butter cookies sandwiched together with rich buttercream, and rolled in crushed peanuts!

Prep Time20

Cook Time10

Total Time30

Course: Dessert

Cuisine: American

Keyword: peanut butter cookie, sandwich cookie

Servings: - 12 sandwich cookies

Calories: 606kcal

Preheat oven to 350 degrees. Line baking sheet with parchment paper and set aside.
In a large bowl, beat the butter, brown sugar, granulated sugar and peanut butter until light and fluffy. Add in the egg and vanilla, mixing until combined.
In a small bowl, whisk together the flour, baking soda and salt. Add half of the flour mixture into the wet mixture and beat until combined.
Add the remaining flour and mix again. Stir in the oats.
Form balls 1 1/2 to 2 Tbsp in size, or use a cookie scoop for more uniformly sized cookies. Place on a cookie sheet 2 inches apart. Bake for 8-10 minutes, just until the tops are set.
Allow the cookies to cool for a few minutes before removing them to a cooling rack. Cool completely before filling the cookies.

Using a hand mixer or stand mixer, beat the butter for a few minutes until light and fluffy. Slowly add in the powdered sugar, 1/2 cup at a time, and continue mixing in between each addition. The mixture will appear very crumbly at this point.
Add in the vanilla and heavy cream and continue mixing until the texture changes to be smooth and creamy.

Fill a piping bag with buttercream and use a 1M tip for a ruffled look or you can cut the tip of the bag off for a more solid look.
Alternatively, spread the buttercream onto the flat side of a cookie and sandwich another one, flat side down, on top.
If using the crushed peanuts, place them on a plate. Once a cookie sandwich has been assembled, roll the edges in the crushed nuts. Repeat with all remaining cookie sandwiches.