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    Home » Recipes » Desserts (Baked) » Peanut Butter Oatmeal Sandwich Cookies recipe

    LAST UPDATED: January 30, 2022 • FIRST PUBLISHED: August 7, 2020 By Toni Dash 28 Comments

    Peanut Butter Oatmeal Sandwich Cookies recipe

    Jump to Recipe

    This post may include affiliate links. As an Amazon Associate I earn from qualifying purchases.

    PEANUT BUTTER OATMEAL SANDWICH COOKIES TITLE

    Imagine your favorite soft and chewy oatmeal cookie recipe with natural peanut butter flavor. Add some vanilla buttercream filling in between and roll the sides in chopped peanuts. Meet your new favorite sandwich cookie recipe!

    PEANUT BUTTER OATMEAL SANDWICH COOKIES TITLE

    The only thing better than freshly baked Peanut Butter Oatmeal Cookies are making two into a sandwich cookie!

    Creamy vanilla filling makes this dessert an exciting treat anytime.

    Perfect for Back-to-School, weekend snacking or a special surprise ‘just because’.

    peanut butter oatmeal sandwich cookies close up

    Peanut Butter Oatmeal Cookies

    These soft-and-chewy inside and light crisp on the outside cookies are always a favorite.

    This dessert recipe is a two-for-one. You can make the delicious cookies and stop there.

    OR you can whip up the easy vanilla buttercream filling and create a one-of-a-kind sandwich cookie. 

    You can also stop THERE or roll the sides in chopped peanuts for a peanut butter lovers dream recipe.

    It also could be rolled in mini chocolate chips!

    peanut butter oatmeal sandwich cookies ingredients

    Recipe Ingredients

    The ingredients for this cookie recipe are probably in your pantry and refrigerator right now!

    There’s nothing exotic, just wholesome baking basics. The star ingredients include:

    Peanut Butter – use creamy peanut butter for the best result.

    Old Fashioned Oats – don’t use Instant Oats. Rolled oats are whole oats and add a different texture to the cookie recipe.

    Unsalted Butter – there is some both in the cookies and the filling. We’ve broken it out in the recipe card below to keep it straight forward.

    How to Make it Gluten-Free

    Use a gluten-free measure-for-measure flour blend. My recommendation is Bob’s Red Mill Gluten-Free 1-to-1 Baking Flour for the best results.

    Also use clearly labeled gluten-free rolled oats. 

    Everything else is naturally gluten-free.

    sandwich cookies in a bowl

    How to Make It – Step-by-Step

    STEP 1: Preheat the oven to 350 degrees F. Line a rimmed baking sheet with parchment paper (unless it is non-stick).

    STEP 2: In a large bowl (or bowl of a standing mixer) combine the butter, granulated sugar, peanut butter, and brown sugar (photos 1-3). Beat until light and fluffy (photo 4).

    peanut butter oatmeal cookies recipe steps 1-4

    STEP 3: Add the egg and vanilla extract; beat until combined (photos 5-7).

    peanut butter oatmeal cookies recipe steps 5-8

    STEP 4: In a small bowl whisk together the flour, baking soda and salt (photo 8). 

    STEP 5: Add half the dry ingredient mixture to the batter, beat together until fully combined (photo 9). Repeat with the remaining flour (photo 10). Stir in the oats (photo 11).

    peanut butter oatmeal cookies recipes steps 9-12a

    STEP 6: Make balls 1 1/2 to 2 inches in diameter. TIP: using a cookie scoop makes this fast, easy and uniform cookie sizing.

    Place on the cookie sheet (photo 12) and bake for 8-10 minutes until the tops are set. Cool on the baking sheet 5 minutes then transfer to a wire rack to cool completely (see photo 13).

    Making the Filling

    STEP 7: Beat the butter until light and fluffy. Add the powdered sugar 1/2 cup at a time (photos 13-14) mixing between additions (note the mixture will appear crumbly).

    peanut butter oatmeal cookies recipes steps 13-16a

    STEP 8: Add the vanilla and cream; beat until the icing forms (photo 15).

    Making the Sandwich Cookies

    STEP 9: After the cookies are completely cooled, spread filling on the bottom of one cookie and place the flat side of a second cookie on top of the filling to form a sandwich (photo 16).

    NOTE: this can be done by spreading the filling on with or piping it for a more decorative look (refer to the printable recipe card below).

    If desired roll the sides of the filling in chopped peanuts.

    sandwich cookies with nuts

    How to Store

    Cookies: Store in a sealed container on the counter top for up to 4 days.

    They can be stored up to a week in the refrigerator but tend to get hard. If chilling them allow the cookies to warm on the countertop before eating.

    Assembled Sandwich Cookies: The assembled sandwich cookies can also be stored in an airtight container at room temperature.

    American Buttercream (the type of filling) does not need to be refrigerated provided it’s not a very hot, humid environment. Then it will melt. 

    Another option is to keep the filling in a separate container in the refrigerator and assemble the cookie sandwiches ‘on demand’.

    peanut butter oatmeal sandwich cookies laying on each other

    More Dessert Recipes You’ll Love!

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    homemade sandwich cookies with a jar of milk

    Did you make it? Please RATE THE RECIPE below!

    Please SUBSCRIBE and FOLLOW ME on FACEBOOK, INSTAGRAM, TWITTER and PINTEREST!

    PEANUT BUTTER OATMEAL SANDWICH COOKIES TITLE

    Peanut Butter Oatmeal Sandwich Cookies

    Homey Peanut Butter Oatmeal cookies are delicious on their own but pair them together with a creamy vanilla buttercream filling and they make a perfect sandwich cookie!
    4.96 from 23 votes
    Print Save Recipe Recipe Saved! Pin Rate
    Course: Dessert
    Cuisine: American
    Prep Time: 20 minutes
    Cook Time: 10 minutes
    Servings: 11 cookie sandwiches (22 cookies)
    Calories: 501kcal
    Author: Toni Dash
    Prevent your screen from going dark

    Ingredients

    Cookies

    • 8 tablespoons (1 stick) Unsalted butter softened
    • 1/2 cup Light brown sugar packed
    • 1/3 cup Granulated sugar
    • 1/2 cup Creamy Peanut Butter
    • 1 Egg
    • 1 teaspoon Vanilla extract
    • 3/4 cup All purpose flour regular or gluten-free measure-for-measure flour blend
    • 3/4 teaspoon Baking soda
    • 1/4 teaspoon Salt
    • 1 cup Old fashioned oats regular or gluten-free

    Filling

    • 12 tablespoons (1 1/2 sticks) Unsalted butter softened
    • 2 1/2 cups Confectioner's (powdered) sugar
    • 1 teaspoon Vanilla extract
    • 1 tablespoon Heavy whipping cream
    • Optional : 1/2 cup finely chopped peanuts OR mini chocolate chips to roll the edges of the cookie in

    Instructions

    Making the Cookies

    • Preheat oven to 350 degrees F. Line cookie sheet with parchment paper or use a non stick cookie sheet.
    • 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 ingredients and beat until combined. Add the remaining flour and mix again.
    • Stir in the oats.
    • Form balls 1 1/2 to 2 tablespoon in size, or use a cookie scoop for better 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 on the baking sheet for five minutes. Then place them on a wire cooling rack to cool completely before making the sandwich cookies.

    Prepare the filling

    • Using a hand mixer or stand mixer, beat the butter for a few minutes until it has become 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 and the icing has formed.

    To Assemble Sandwich Cookies (pick one of the following two methods)

    • OPTION 1: Spread the icing onto a bottom of a cookie (flat side) and top it with another cookie flat side facing the filling.
    • OPTION 2: For a fancier ook, fill a piping bag with the icing and use a 1M tip for a ruffled effect. Or cut the tip of the bag off (no tip required) and pipe the icing through the cut end.

    Optional Nuts around the Filling outside

    • To coat the exterior of the filling with nuts, prepare a cookie sandwich. Roll the edges in a bowl of nuts.

    Notes

    To make it Gluten-Free:

    • Use gluten-free measure-for-measure flour blend. I recommend Bob’s Red Mill Gluten-Free 1-to-1 Baking Flour.
    • Also be sure to select gluten-free Old Fashioned Rolled Oats.

    Nutrition

    Calories: 501kcal | Carbohydrates: 57g | Protein: 6g | Fat: 29g | Saturated Fat: 16g | Cholesterol: 75mg | Sodium: 195mg | Potassium: 135mg | Fiber: 2g | Sugar: 44g | Vitamin A: 714IU | Calcium: 27mg | Iron: 1mg
    Did you make this recipe?Mention @boulderlocavore or tag #boulderlocavore!
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    ABOUT THE AUTHOR

    TONI DASH
    Toni Dash head shot

    Toni Dash, is a Certified Nutrition Coach and the writer/blogger, photographer, recipe developer and creator of Boulder Locavore®. She has been developing easy to make, well-tested recipes since 2010. Her seasonal recipes bring excitement to the dining table for both gluten-free and gluten diners. Toni has been featured in numerous publications and on culinary websites for her creative, delicious recipes and travel features. For more details, check out her About page.

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    Reader Interactions

    Comments

    1. Shelly says

      July 10, 2021 at 7:50 pm

      4 stars
      Love the cookies but not the icing. Way too sweet for me. Next time I will just make the cookies rather than the sandwiches.

      Reply
      • Toni Dash says

        July 10, 2021 at 9:04 pm

        Sorry the filling wasn’t to your liking Shelly. But glad you enjoyed the cookies!

        Reply
    2. Jitka says

      January 16, 2021 at 2:29 pm

      5 stars
      Chewy cookies are now my hubby’s favorite.

      Reply
    3. Judy Yamaguchi says

      October 22, 2020 at 1:48 am

      5 stars
      DELICIOUS! Didn’t last two days with my adult sons who don’t normally go for sweets! Love the cookies!

      Reply
    4. Sandra says

      August 11, 2020 at 1:11 pm

      5 stars
      My kids really loved it!! So good and delicious!

      Reply
    5. Nancy says

      August 10, 2020 at 1:04 pm

      5 stars
      Peanut butter cookies are my all time favorite! These turned out great!

      Reply
    6. Suzy says

      August 10, 2020 at 11:00 am

      5 stars
      These are incredibly good! Love the filling inside the cookies!

      Reply
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    About Toni Dash

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    Welcome! I’m Toni. I’m a Certified Nutrition Coach and my goal is to MAKE YOUR LIFE EASIER with delicious, well-tested recipes and travel tips! More About Me …

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