I like sandwiches. And I like cookies.

Chewy Black + White Chip Oatmeal Sandwich Cookies with Marshmallow Buttercream Filling I howsweeteats.com

However, would I like sandwiches in my cookies or cookies in my sandwiches? The latter… probably yes.

While most of my favorite sandwiches consist of some sort of crunchy bacon and toast and aioli and poached eggs, I wasn’t sure how well that would pair with a cookie. You know. You get it.

Hence the buttercream filling. Wait. The MARSHMALLOW buttercream filling.

Oh don’t get too excited. It’s just butter, marshmallow fluff (real or store bought works) and sugar. Fancy fancy. But not at all.

Chewy Black + White Chip Oatmeal Sandwich Cookies with Marshmallow Buttercream Filling I howsweeteats.com

Guess what? It’s exactly one week until Christmas and I haven’t baked a thing yet. Well, besides these. Like they would even last a week. I have a list to get through people. I’m starting today.

That’s a lie. I’ll probably start on Saturday at midnight.

I’ll blast Mariah Carey, Barry Manilow, N*SYNC and maybe Lady Antebellum Christmas music. With a hint of Ariana Grande santa baby. I sort of have holiday iTunes ADD.

Chewy Black + White Chip Oatmeal Sandwich Cookies with Marshmallow Buttercream Filling I howsweeteats.com

I’m copping out today like I do every now and then and using this chewy oatmeal chocolate chip recipe from a few years ago. I absolutely adore it and it’s one cookie I make constantly, regardless of how many new recipes need to come out of my kitchen. This time though, I swapped the baking powder for baking soda (accidentally on purpose, but not really. How does one go to the store every single day, sometimes multiple times per day, and still forget things?) resulting in a slightly thinner cookie but a chewy one nonetheless.

Ohmahgah. I can’t even stand the chewiness. It’s so ridiculously fabulous.

These cookies are thin and a bit crisp, but still packed with some chew. It’s like my dream is a little baked dough ball.

I’d like to faceplant into the center of these sandwiches and get stuck there for the next few days. Figuratively speaking, of course. I’m probably one of the only ones in the universe, but I LOVE this crazy time of year. I adore the hustle and bustle. I love going shopping or heck, just going to the mall and watching others shop. This season does not stress me out nor do I wish it away. I live for it. Crazy?

Maybe one day if I have some kids that will change, but I’m hoping not. It’s so fun. ‘Tis the season to wear glittery eye shadow, sparkles on your face and sequins on, well, everything. ‘Tis the season to stuff your face with cookies for breakfast and then go for a run.

Seriously the best time of year.

Chewy Black + White Chip Oatmeal Sandwich Cookies with Marshmallow Buttercream Filling I howsweeteats.com


Chewy Black + White Chip Oatmeal Sandwich Cookies with Marshmallow Buttercream Filling

Yield: makes 2 dozen cookies, 1 dozen sandwiches

Total Time: 2 hours (includes cooling time)


1/2 cup unsalted butter, at room temperature
1/2 cup sugar
1/2 cup loosely packed brown sugar
1 large egg
2 teaspoons vanilla extract
1 1/4 cup all-purpose flour
1/2 teaspoon baking soda
1/4 teaspoon salt
3/4 cups rolled oats
optional: 1-2 tablespoons milk, if dough is super crumbly
2/3 cup dark chocolate chips
2/3 cup white chocolate chips

marshmallow buttercream filling
1/2 cup unsalted butter, softened
1 cup marshmallow cream (homemade or store-bought is fine)
1/2 cup powdered sugar
1 teaspoon vanilla extract
1 pinch of salt


Preheat the oven to 375 degrees F.

Add the butter to the bowl of your electric mixer and beat until creamy. Add in the sugars and beat on high speed until fluffy, about 2 to 3 minutes. Add the egg and vanilla, mixing well until combined, about 2 minutes. Stir in the flour, baking soda and salt with the mixer on medium speed. Beat in oats until just combined. Add in 1 tablespoon milk if the dough appears too crumbly. Fold in the chocolate chips. Refrigerate the dough for 30 minutes.

Roll the dough in to equally sized 1-inch balls and place them on a nonstick baking sheet 2 inches apart. Bake for 9 to 11 minutes, until the edges are just golden. Wait until the cookies cool COMPLETELY before adding the buttercream in the center and sandwiching the cookies together.

marshmallow buttercream filling
Add the butter to the bowl of your electric mixer and beat until creamy. Add in the marshmallow and beat on medium speed until the mixture comes together, about 2 minutes. Add in the sugar, vanilla extract and salt, mixing on medium speed for another minute. Scrape down the sides of the bowl and mix the buttercream on high for 2 to 3 full minutes.

Chewy Black + White Chip Oatmeal Sandwich Cookies with Marshmallow Buttercream Filling I howsweeteats.com

A cookie cannonball into the center would be ideal.

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35 Responses to “Chewy Black + White Chip Oatmeal Sandwich Cookies.”

  1. #
    Taylor @ FoodFaithFitness — December 18, 2013 @ 8:20 am

    I totally love this time of year too! I also love these cookies. Marshmallow, butter cream, oatmeal, chewy AND crunchy?…I just died.


  2. #
    Brie @ Entrée the Giant — December 18, 2013 @ 8:38 am

    I think you have the right idea with all the Christmas chaos – it’s easy to fall into the camp of people who hate it, but why do that?! It’s only for a few weeks – and it’s only once a year!

    I say bring on the hectic and the hustle/bustle…and while you’re at it…bring on these cookies.


  3. #
    Angela @ Eat Spin Run Repeat — December 18, 2013 @ 8:42 am

    Ok, I’ve said it before that I’m not normally into sweets and crave a lot more of the savoury types of foods, but you have got me SERIOUSLY wanting some of these right now! Can I just stay home from work and bake all day? ;)


  4. #
    Ali @ Peaches and Football — December 18, 2013 @ 8:57 am

    I am so appreciative of cookie recipes this time of year. We’re planning a day of baking at my parents’ house on saturday and I’ve wanted to make something new and different to share this year. I had planned to make a bunch of dough ahead of time and bake when I get there, but I might whip some up the day before so I can nibble alone… He he :)


  5. #
    JenJen — December 18, 2013 @ 9:15 am

    I love this time of year too! I look forward to going out and dealing with the traffic and the amount of people, it’s just so exciting!


  6. #
    Cate @ Chez CateyLou — December 18, 2013 @ 9:23 am

    A cookie sandwich, yes!! These look amazing, that marshmallow buttercream sounds divine!


  7. #
    Erin | The Law Student's Wife — December 18, 2013 @ 9:36 am

    First you take the mallow…then you turn it into buttercream and stuff it into a cookie. That’s how that sentence ends, right?


  8. #
    Belinda@themoonblushbaker — December 18, 2013 @ 9:39 am

    I ridiculously love the marshmallow filling. I am a big fan and have used in in numerous recipes, i filled iced vovo macarons with it a few weeks ago. SO creamy and delicious! It is the perfect cookie filling.


  9. #
    Laura @ Laura's Culinary Adventures — December 18, 2013 @ 9:42 am

    Marshmallow Butter Cream?! How great is that! I love this time of year too!


  10. #
    Carrie @ Bakeaholic Mama — December 18, 2013 @ 9:55 am

    Mallow frosting? I want a bowl and a spoon. Though sandwiched between oatmeal cookies is great too ;)


  11. #
    Averie @ Averie Cooks — December 18, 2013 @ 10:09 am

    I really want to eat the marshmallow buttercream by the spoonful! And these cookies look so chewy! Just absolutely the perfect stuffing vehicles for copious amounts of the marshmallow buttercream! I love oatmeal cookies and would probably take them over choc chip, even – so I know I need these sandwiches! Good luck w/ your bake-athon!


  12. #
    Ashley — December 18, 2013 @ 10:20 am

    The best time of year is right. :) Now, cookie-sandwich me.


  13. #
    Brian @ A Thought For Food — December 18, 2013 @ 10:51 am

    Ummmmmm… girl, these look DAMN GOOD!

    Wishing you a very Merry Christmas… hope it’s filled with wonderful food and drink and good company.


  14. #
    DessertForTwo — December 18, 2013 @ 11:05 am

    Don’t worry, i haven’t started baking yet either. But I have started recipe development work for Valentine’s Day. Weird, I know.
    I want 100 of these sandwiches delivered to my gingerbread house, please.


  15. #
    Lily @ Life, Love, and Cupcakes — December 18, 2013 @ 11:24 am

    I just made cookies last night for a work cookie exchange, but other than that I’m totally behind on the holiday baking! Tonight or tomorrow I’ll probably start the cookies to give to neighbors!


  16. #
    Christina @ The Beautiful Balance — December 18, 2013 @ 11:59 am

    Can I just eat the buttercream filling? If that’s wrong, I don’t want to be right!


  17. #
    Laura (Blogging Over Thyme) — December 18, 2013 @ 1:32 pm

    These are some pretty perfect looking cookies. Ooooh, I’m also imagining them with all sorts of buttercream now too. Like maple! YUM!


  18. #
    ATasteOfMadness — December 18, 2013 @ 2:21 pm

    I second the faceplanting into these cookies. They look fabulous!


  19. #
    Sues — December 18, 2013 @ 2:22 pm

    These are simply gorgeous! They’d last in my apartment about an hour.


  20. #
    dishing up the dirt — December 18, 2013 @ 2:25 pm

    I can already feel my sugar crash! These look worth it though!


  21. #
    kylie @ immaeatthat — December 18, 2013 @ 2:51 pm

    I’m rather impressed by your cookie stacking skills:)


  22. #
    Katrina @ WVS — December 18, 2013 @ 3:42 pm

    I like sandwiches and cookies too!! TOGETHER FOREVER!


  23. #
    Haley — December 18, 2013 @ 3:56 pm

    okay YUM these look amazing. they’re going on my holiday cookie-baking list ASAP!


  24. #
    Christine @ Cooking with Cakes — December 18, 2013 @ 4:18 pm

    FREEZE THESE. then eat them. then die of happiness. the end. xxxx


  25. #
    allie@sweetpotatobites — December 18, 2013 @ 4:42 pm

    I make oatmeal cookies using white and dark chocolate chips all the time – it’s the best! I’ll definitely need to try the cookie sandwich though. Or maybe put some ice cream in the middle of these bad boys.


  26. #
    bridget350@gmail.com — December 18, 2013 @ 6:49 pm

    sign me up for ANYTHING with marshmallow fluff!!!


  27. #
    Pamela @ Brooklyn Farm Girl — December 18, 2013 @ 6:50 pm

    Super yum to these cookies Jessica, I could eat a couple for sure!


  28. #
    Ashley | Spoonful of Flavor — December 18, 2013 @ 7:24 pm

    I think I just died and went to cookie heaven! I love the combination of oatmeal, chocolate and marshmallow buttercream.


  29. #
    Angelyn @ Everyday Desserts — December 18, 2013 @ 7:26 pm

    Not kidding when I say I love everything about this! UGH.


  30. #
    Barbara | Creative Culinary — December 19, 2013 @ 12:34 pm

    I’m just glad these cookies just look like cookies. Whew!

    And on another note…I’ve been making a chocolate chip oatmeal cookie for years that was my Grandma’s recipe…I can almost taste it with this twist on buttercream but I will be coming to your house to try them.

    There is no Christmas here, no tree, no music, no joy…nuttin honey. If I miss escaping from here and getting in my home before Christmas than I am officially declaring it a two month event for January will be mine to celebrate. Wanna join me? I’ll have a tree to decorate, cookies to make and yes, shopping to do. You would be the perfect partner in crime!


  31. #
    Melissa @ Treats With a Twist — December 19, 2013 @ 2:47 pm

    Gah, I want this SO bad…but you KNOW its just because I want to lick all that icing off! Yummmmm
    I love all the Christmas shoppers too. It funny to go to Target and see people wildly throwing things in their carts for gifts because they have no clue what to get someone…and I would be nice and tell them that Aunt Sally really won’t want those weird creepy socks…but its more fun to watch then to speak up in a moment like that ;)


  32. #
    Alexe @ Keys to the Cucina — December 19, 2013 @ 5:57 pm

    Wow these look beautiful and delish, I love me some oatmeal cookies!


  33. #
    Sufyan — December 22, 2013 @ 10:23 am

    My Uncle Luke recently got Mercedes M-Class Diesel by part-time working online at home… go to this web-site…xurl.es/q8kzy


  34. #
    kristen — December 24, 2013 @ 12:38 am

    My boys and I made these today – they turned out great. A new favourite!



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