Peanut Butter Cookie Sandwiches are a naturally gluten free treat that appeals to all peanut butter lovers! This cookie sandwich recipe has soft and chewy flourless peanut butter oat cookies with a creamy peanut butter filling for a classic Girl Scout Do-Si-Dos taste, but infinitely better!

Ingredients Needed

There are two parts of this recipe – the old school peanut butter cookies and peanut butter filling to make the sandwiches. Both are pretty effortless to make and don’t require any speciality ingredients!

Flourless Peanut Butter Oat Cookies:

Creamy Peanut Butter
Sugar
Brown Sugar
Eggs
Vanilla Extract
Baking Soda
Salt
Quick-Cooking Oats – Use certified gluten free oats for gluten free cookies.

Peanut Butter Filling for Cookies:

For the copycat Nutter Butter or Do-si-Do Girl Scout Cookie taste, whip up this easy filling for the sandwich cookies. However, you can also change up the taste by using another of the suggested fillings listed further down in the post.

If you would like to leave out the filling and just have the peanut butter cookies, follow the recipe for flourless chocolate chip cookies.

Softened Butter
Creamy Peanut Butter
Powdered Sugar
Milk or dairy-free milk

How To Make Peanut butter cookie sandwiches recipe

In a large bowl mix together the peanut butter, sugar, and brown sugar until creamy and smooth. This will take about 1 minute.
Add the eggs and vanilla. Beat again until combined.
Mix in the baking soda, salt, and oats on low speed.
Roll the dough into 1 inch balls or use a small cookie scoop to evenly portion and place on the baking sheets. Use a fork dipped in sugar to make a cross hatch on the cookies, flattening slightly.
Bake for 8-10 minutes and cool completely before filling.

Peanut Butter Filling for Cookies

To make these cookie sandwiches dairy free, simply substitute your preferred non-dairy milk, such as almond milk, in the filling recipe.

If you plan on making the peanut butter filling ahead of time, cover tightly and let it sit at room temperature so it stays soft and spreadable.

Beat together the peanut butter and butter until smooth. Add the powdered sugar and milk, beating until well combined and creamy.
Lay half the peanut butter cookies, bottom side up on a baking sheet. Divide a heaping tablespoon of filling between the cookies. Once it has been divided up evenly, top with another cookie and press gently.

Alternative fillings for cookie sandwiches

The possibilities are endless for what pairs fabulously with peanut butter cookies! Use one of listed cookie fillings below, or even better, add a combination of two fillings in one cookie!

Nutella
Jam
Chocolate Ganache (follow recipe for Chocolate Peanut Butter Pie topping)
Buttercream Frosting (halve the recipe for Chocolate or Vanilla frosting recipes)
Marshmallow Cream (beat together 1/2 cup butter, 7.5 ounce marshmallow fluff, and 1 cup powdered sugar on high speed until light and fluffy)
Ice Cream

Is this cookie sandwich recipe gluten free?

Yes, these flourless peanut butter cookies are naturally gluten free. They do use some oats to cut the sweetness and help with the cookie sandwich structure. If you cannot tolerate oats, or would like a completely grain free dessert, there are easy alternatives!

One option is to omit the oats from the recipe and proceed with it as written, baking the cookies for 8-10 minutes.

Another option is to make a slightly different version of gluten free, flourless peanut butter cookies, using Almond Flour Peanut Butter Cookies recipe. If you follow the recipes’ directions, it will yield 32 cookies, which is slightly less than this recipe.

Either portion the cookies slightly smaller or make a few less peanut butter cookie sandwiches. You will have a bit cookie of filling leftover, but you can freeze or refrigerate it it for layer, dip pretzels in it, or slather on store-bought cookies.

Storing recommendations

Peanut Butter Sandwich Cookies should be stored in airtight container at room temperature. For optimal freshness, I recommend wrapping each cookie sandwich in plastic wrap and storing in a container up to 1 week.

These cookies also freeze very well. After wrapping the cookies in plastic wrap, transfer to a ziplock freezer bag. Freeze up to 3 months, thawing at room temperature.

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