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Oatmeal Sandwich Cookies with Vanilla Buttercream

Filed Under: Cookie Recipes, Dessert Recipes, Fall & Winter, Spring & Summer, Vegetarian Recipes

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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 served on a white plate

The moment I clicked through to Thalia’s blog post, I knew that I would have to make these cookies. If you haven’t visited Butter and Brioche, you must. Her recipes are creative and utterly reliable. Her recipe was for Oatmeal Sandwich Cookies with Smoked Treacle Buttercream. I’ll be honest, I’d never heard of  Treacle, but discovered that it is the British term for molasses. Though her cookies sound perfect as is, I decided to riff on the recipe. I swapped in whole grain flour and stirred in walnuts instead of pecans because I happened to have them on hand. 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!

Print Recipe
5 from 3 votes

Oatmeal Sandwich Cookies with Vanilla Bean Buttercream

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.
Prep Time20 mins
Cook Time10 mins
Total Time30 mins
Course: Dessert
Cuisine: American
Servings: 25 sandwich cookies
Calories: 306kcal

Ingredients

For the Cookies:

  • 2/3 cup unsalted butter at room temperature
  • 1/2 cup granulated sugar
  • 3/4 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:

Nutrition

Calories: 306kcal | Carbohydrates: 34g | Protein: 2g | Fat: 18g | Saturated Fat: 10g | Cholesterol: 48mg | Sodium: 175mg | Potassium: 81mg | Fiber: 1g | Sugar: 24g | Vitamin A: 10% | Calcium: 3.3% | Iron: 3.6%
Tried this recipe?I'd love to see it! Tag me on Instagram at @pinchandswirl or leave me a comment and rating below.
Oatmeal Sandwich Cookies with Fluffy Vanilla Buttercream 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.

About Marissa

The best food happens at home. I love delicious food prepared simply with fresh ingredients and that’s just what you’ll find here! You can count on me for well tested, easy, mouthwatering recipes designed for home cooks.

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Comments

  2. David @ Spiced says

    May 2, 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


    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

  6. Cheyanne @ No Spoon Necessary says

    April 13, 2017 at 4:19 pm


    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

  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

  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

  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

  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

  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

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