This post may contain affiliate links. Please read our disclosure policy.
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.
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.
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.
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 with Vanilla Bean Buttercream
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:
- 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
Nutrition information is automatically calculated, so should only be used as an approximation.
Great Recipe. I Wonder how you make these wonderful recipes.
Good work for the foodies!
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!
These little cookie sandwiches look fantastic, Marissa! The combo of oats, walnuts, cinnamon, and slightly salter buttercream frosting makes the perfect treat. Well done!
Thank you, my friend!
These look amazing! Why aren’t you across the street from me so I can help you with the clean up? ?
I wish you lived across the street, Mary! xo
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!
Yes! Hooray for two-cookies-for-one (and bonus buttercream)! Happy Easter to you!! xo