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    Recipes » Desserts » Cookies and Brownies

    Oatmeal Sandwich Cookies with Vanilla Buttercream

    Published: Apr 13, 2017 · Modified: Nov 24, 2020 by Marissa Stevens · 38 Comments

    Vegetarian

    This post may contain affiliate links.

    Jump to Recipe
    stacked oatmeal sandwich cookies

    Oatmeal Sandwich Cookies with Fluffy Vanilla Buttercream Frosting will make you weak in the knees they're so good. I'm not kidding! They're also very rich. So make the cookies tiny - about a tablespoon of dough per cookie - and you'll end up with cookies that are two or three bites of heaven.

    Oatmeal Sandwich Cookies stacked on a white plate

    These oatmeal sandwich cookies have a satisfyingly complex flavor and texture, one that you'll want to savor. Made with whole grain flour, thick rolled oats, crunchy walnuts, and ample cinnamon. And for the sandwich filling, I went with fluffy vanilla buttercream frosting - my favorite. 

    Oatmeal Cookies Ready to Bake

    When you make these, I recommend that you make them very small, just one or two bites. They are incredibly rich. I love this 1 tablespoon scoop, it's perfect for scooping cookie dough and frosting for the middle.

    Oatmeal-Sandwich-Cookie-with-Vanilla-Buttercream-Frosting ready to top
    Oatmeal-Sandwich-Cookies-Stacked

    This recipe makes about 25 little sandwich cookies. They make a great edible gift, party or holiday treat and they freeze well too!

    Oatmeal Sandwich Cookies stacked on a white plate

    Oatmeal Sandwich Cookies with Vanilla Bean Buttercream

    Marissa Stevens
    If you don't feel like making the buttercream, the oatmeal cookies are wonderful on their own. You could add chocolate chips or raisins too.
    5 from 3 votes
    Save Recipe Saved! Print Recipe Pin Recipe
    Prep Time 20 mins
    Cook Time 10 mins
    Total Time 30 mins
    Course Dessert
    Cuisine American
    Servings 25 sandwich cookies
    Calories 306 kcal

    Ingredients
      

    For the Cookies:

    • ⅔ cup unsalted butter at room temperature
    • ½ cup granulated sugar
    • ¾ cup brown sugar packed
    • 1 egg
    • 1 tablespoon vanilla extract
    • 1 tsp white vinegar
    • ½ tsp salt
    • 1 tsp baking powder
    • ½ tsp baking soda
    • 1 tbsp ground cinnamon
    • 1 cup white whole wheat flour 120 g
    • 2 ½ cups old-fashioned oats 240 g
    • ½ cup chopped walnuts 75 g
    • 1 recipe Fluffy Vanilla Buttercream Frosting

    Instructions
     

    For the Oatmeal Cookies:

    • Preheat oven to 350°F.
    • Line a baking sheet with parchment paper.
    • In a medium bowl, whisk together the flour, baking powder, baking soda, cinnamon and salt. Set aside.
    • Add butter and sugars to the bowl of a stand mixer fitted with the paddle attachment. Beat at low speed until combined; increase speed and beat until fluffy, 2 to 3 minutes more. Add egg, vanilla and vinegar; beat well, scraping down sides of bowl as needed. Add flour mixture – cover mixer with a kitchen towel to protect your counters from a flour flurry. Start at low speed to stir, then increase to medium and mix until fully combined. Add rolled oats and walnuts; mix just until combined.
    • Scoop dough into walnut sized balls (my favorite cookie scoop) and arrange about 2-inches apart on prepared baking sheet. Bake for 8 to 10 minutes, until golden brown on the edges and still soft in the middle. Let rest a few minutes on baking sheet before transferring to a cooling rack. Repeat process with remaining dough.

    To Assemble Oatmeal Sandwich Cookies:

    • Once the cookies have cooled, spread your desired amount of fluffy vanilla buttercream frosting on the bottom side of one cookie, and top with another.

    Nutrition

    Calories: 306kcalCarbohydrates: 34gProtein: 2gFat: 18gSaturated Fat: 10gCholesterol: 48mgSodium: 175mgPotassium: 81mgFiber: 1gSugar: 24gVitamin A: 500IUCalcium: 33mgIron: 0.6mg
    Tried this recipe?I'd love to see it! Tag me on Instagram at @pinchandswirl or leave me a comment and rating below.

    More Cookies and Brownies

    • Italian Wedding Cookies
    • Gingersnap Cookies
    • Oat Flour Chocolate Chip Cookies
    • Almond Flour Peanut Butter Cookies

    Reader Interactions

    Comments

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      Recipe Rating




    1. Paolo Coleho says

      May 29, 2018 at 10:57 pm

      5 stars
      Great Recipe. I Wonder how you make these wonderful recipes.
      Good work for the foodies!

      Reply
    2. David @ Spiced says

      May 02, 2017 at 4:35 am

      I absolutely love Thalia's blog! She posts the most amazing looking cakes and other sweets. Speaking of amazing, I'm thinking these cookies need to happen ASAP. I love oatmeal cookies, and I love vanilla buttercream...so this one combines 2 of my favorites. 🙂 I'll take a baker's dozen today, please!

      Reply
    3. Ben Maclain says

      April 15, 2017 at 8:16 am

      5 stars
      These little cookie sandwiches look fantastic, Marissa! The combo of oats, walnuts, cinnamon, and slightly salter buttercream frosting makes the perfect treat. Well done!

      Reply
      • Marissa says

        April 16, 2017 at 12:44 pm

        Thank you, my friend!

        Reply
    4. Mary says

      April 14, 2017 at 9:15 pm

      These look amazing! Why aren't you across the street from me so I can help you with the clean up? ?

      Reply
      • Marissa says

        April 16, 2017 at 12:45 pm

        I wish you lived across the street, Mary! xo

        Reply
    5. Dawn - Girl Heart Food says

      April 14, 2017 at 6:52 am

      I love sandwich cookies cause it's like two cookies for one 🙂 !! Oatmeal cookies are a favourite around here so I can definitely see these happening in our kitchen! Pinned! Happy Easter!

      Reply
      • Marissa says

        April 14, 2017 at 12:57 pm

        Yes! Hooray for two-cookies-for-one (and bonus buttercream)! Happy Easter to you!! xo

        Reply
    6. Cheyanne @ No Spoon Necessary says

      April 13, 2017 at 4:19 pm

      5 stars
      Thalia’s blog is absolutely BEAUTIFUL! Her photos are stunning and creations are just genius, right?! Love that she inspired these stellar sandos! I have a SERIOUS weakness for oatmeal sandwich cookies. Like, I can NOT be trusted around them, because I will eat them all. I'm not kidding! 😉 So you know I'm just dying over these, Marissa!!! They look fabulous and that vanilla buttercream looks dangerously delicious!! Gorgeous photos, my dear! I'm drooling! Pinned! Cheers! I hope you and your family have a beautiful Easter! <3

      Reply
      • Marissa says

        April 14, 2017 at 12:58 pm

        Aww...thank you, Cheyanne!! Hope you have a beautiful Easter too! xo

        Reply
    7. Colormelimitlessly by Kaisha says

      January 03, 2015 at 12:04 pm

      This looks so good!

      Reply
      • Marissa says

        January 03, 2015 at 12:22 pm

        Thanks, Kaisha!

        Reply
    8. Jess @ whatjessicabakednext.com says

      January 01, 2015 at 1:55 pm

      These oatmeal sandwich cookies look amazing! Love that they're filled with the amazing and very delectable vanilla buttercream! Yum- thanks for sharing your lovely recipe!

      Reply
      • Marissa says

        January 01, 2015 at 1:57 pm

        What a sweet note, thank you!

        Reply
    9. Kristi @ Inspiration Kitchen says

      December 31, 2014 at 6:18 am

      These look absolutely fabulous Marrisa (pinned)! I wanted to stop by today to wish you a Happy New Year! Here's looking forward to wonderful things for you and your family in 2015!

      Reply
      • Marissa says

        December 31, 2014 at 8:45 am

        Happy New Year, Kristi! xo

        Reply
    10. Sonali- The Foodie Physician says

      December 30, 2014 at 2:24 pm

      These look so delicious and your photos are gorgeous! I just took my first look at Thalia's blog and I totally see what you mean!

      Reply
      • Marissa says

        December 30, 2014 at 3:06 pm

        Thank you, Sonali. She's a talent, isn't she!

        Reply
    11. Anu says

      December 30, 2014 at 7:21 am

      Saw this of G+ community and had to stop in to say how incredibly gorgeous this is. Oatmeal Sandwich Cookies looks Stunningly delicious! 🙂

      Reply
      • Marissa says

        December 30, 2014 at 8:17 am

        Hi, Anu! Thanks so much!

        Reply
    12. Faith (An Edible Mosaic) says

      December 30, 2014 at 4:40 am

      I love Thalia's blog too! She is incredibly talented. Thank you for sharing these beautiful cookies - we're having a small New Year's Eve party and I've been thinking about what kind of cookies to make! 🙂

      Reply
      • Marissa says

        December 30, 2014 at 8:17 am

        If you end up making them, I'd love to hear what you think! xx

        Reply
    13. nagimaehashi says

      December 30, 2014 at 12:24 am

      Isn't Thalia a legend?? I LOVE her blog, and you are so right, there is something "sexy" about it!! I love these! I must give it a go - I love the rustic, lumpy oatmeal with that rich smooth buttercream in it.....so bummed you don't live closer, I just want to camp out at your dining table and eat all the amazing stuff you cook!

      Reply
      • Marissa says

        December 30, 2014 at 8:17 am

        That makes two of us - I have a feeling that you and I could cook up some incredible feasts! 😉

        Reply
    14. Lorraine @ Not Quite Nigella says

      December 29, 2014 at 11:07 pm

      I saw these on your IG and thought that they looked amazingly tempting! 😀

      Reply
      • Marissa says

        December 30, 2014 at 8:16 am

        Thanks, Lorraine!

        Reply
    15. Lyubomira says

      December 29, 2014 at 3:56 pm

      These cookies look beautiful and delicious! The vanilla bean buttercream sounds amazing! Definitely have to try them! Love Thalia's blog and it is good to know how reliable her recipes are 🙂

      Reply
      • Marissa says

        December 30, 2014 at 8:16 am

        Thank you, Lyubormira!

        Reply
    16. hapanom says

      December 29, 2014 at 10:26 am

      Yum!!! These look and sound amazing! I'm drooling just thinking of the buttercream! Pinned!

      Reply
      • Marissa says

        December 29, 2014 at 10:51 am

        Thanks so much!

        Reply
    17. Kevin | keviniscooking says

      December 29, 2014 at 9:15 am

      These look and sound incredible. I think I'll add a little maple syrup to the buttercream and call it a day. Yum, looking forward to making these, thanks Marissa!

      Reply
      • Marissa says

        December 29, 2014 at 10:50 am

        Love the idea of maple syrup, Kevin!

        Reply
    18. hipfoodiemom says

      December 29, 2014 at 7:07 am

      Marissa! These cookies look amazing!!! and I love Butter and Brioche. . definitely tagging this for later. . my goal in the new year is to try to eat a bit healthier with treats like this scattered throughout! 😛 happy NYE!

      Reply
      • Marissa says

        December 29, 2014 at 10:50 am

        Thanks Alice! Happy NYE!!

        Reply
    19. Thalia says

      December 28, 2014 at 11:08 pm

      Love your take on the cookies, Marissa! x

      Reply
      • Marissa says

        December 29, 2014 at 10:49 am

        Thank you for the inspiration, Thalia!

        Reply
    20. Carla says

      December 28, 2014 at 7:46 pm

      YUMMM. Oatmeal sandwich cookies are the BEST cookies! Something about their hearty bite. 🙂

      Reply
      • Marissa says

        December 29, 2014 at 10:49 am

        I agree, Carla!

        Reply

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