Oatmeal Chocolate Chunk Sandwich Cookies

These Oatmeal Chocolate Chunk Cookie recipe is sandwiched with a mascarpone buttercream. These Easy Oatmeal Cookies are quick to make and pair perfectly with the easy mascarpone cookie filling.

Hiiiiii! Hope your week isn’t giving you too much grief - and if it is, hopefully these wee cookie sandwiches make it better! I’ve been laying low recently, trying to get on top of what kind of feels like a never ending job list - we hid at home over the weekend to get some of it done. They aren’t exciting or big jobs - just a whole lot of those dumb ones that you let build up and suddenly feel like you’re drowning in. I’m sure it’s not just me who gets this? February is classic intense homesick time for me, so I kind of just stick my head down, keep to a routine, make sure I get out of the house enough, and ride it out. It seems to be working. Cookies definitely help.

These wee numbers come from my friends over at Cook: Real Food Everyday magazine! They are the savoury sister to Bake from Scratch, and each issue is jammed full of so many amazing dinner ideas - some of our absolute faves come from there! After a day of recipe testing baking recipes, I find it super relaxing to just follow a recipe for dinner, so am always on the lookout for inspiration. You can subscribe through their website - they have a digital version too if you’re not based in the states!

Alongside all their amazing savoury content, the magazine also has a couple of recipes perfect for weeknight baking - these Oatmeal Chocolate Chunk Sandwich Cookies with Mascarpone Filling are from their latest issue! They are super simple to make, and the mascarpone filling really just takes them over the edge to make the perfect, easy to make cookie sandwich. I couldn’t help but doctor the recipe just a teeny bit - I used some muscovado sugar in place of some of the brown, used half old fashioned oats and half quick cooking to give some chew, and also added a little chocolate. All of these variations are totally optional - I will list the alternatives in the notes!

A few wee tips:

• A couple of pointers from Cook: Make sure that your mascarpone and butter are the same temperature when you make the cookies, to ensure that the frosting comes together nicely. If it seems like it is splitting a little, I sometimes take out a tablespoon or two and melt it in the microwave, then whip it back into the mixture to help even out the temperature.
• I like to roughly chop some of my chocolate for this, to help distribute it a little! I pulled some of the chunks out of the batter and put them on top of the dough balls to ensure some chocolate on the tops of the cookies!
• The cookies alone are bomb. I made a batch as a test and they got demolished, so if you don’t want to fill them, then you can have them as is!
• I subbed some of the quick cooking oats for old fashioned oats, which have a bit more substance to them. I just did half of the amount by weight - if you only have quick cooking oats, or only old fashioned, either work! I probably should have accounted for the change in weight with subbing old fashioned oats, but I winged it and it worked just fine. Haha. Whoops.
• I also added chopped chocolate - leave it out if you want!
• The final sub I made was swapping a little of the light brown sugar for muscovado - if you do not have this on hand, use the same amount of brown sugar in place of muscovado!
• The cookies might come out of the oven looking not quite perfectly round - for sandwich cookies I like to have them as round as possible! To help correct this, I take a round cookie cutter bigger than the cookie, and use it to nudge the still warm cookie into a round shape.
• You may have more cookies than you have baking sheets for. This happens to me often - just hold off scooping all of them, and then once the first batch is out and cooled enough to move to a rack, re-use that baking sheet.

Made this recipe and love it?

If you made this recipe then I would LOVE for you to leave me a review below to let me know how you liked it! Also, please make sure to tag me on Instagram if you make it!

A note on salt and oven temperature

It is important to note the type of salt that is called for in a recipe. I use Diamond Crystal salt throughout my recipes - if you use a different sort of kosher salt or regular table salt you will need to adjust accordingly as some salt is 'saltier' than others. Morton's salt is twice as salty, so you will need half the quantity. Same goes for a regular table salt. I am working to get gram measurements throughout my recipes for salt but still getting there.

All oven temperatures are conventional unless otherwise stated. If you are baking on fan / convection, you will need to adjust the temperature. An oven thermometer is a great investment to ensure that your oven is the correct temperature.

Using the double / triple function in the recipe card

You will notice that there is a '1X' '2X' '3X' button in my recipe card. This can be used for doubling or tripling a recipe. However, please note that this only doubles the ingredient quantities in the ingredients list and NOT in the method. If there are quantities or pan sizes in the method of the recipe (for example weigh out 150g brown butter), you will need to scale this number manually. It will also not change the baking time in the recipe so you will need to adjust this yourself too. It is always a good idea to read through a recipe fully before doubling it just to check this. If you would like to scale this recipe or convert for another pan size, use my calculator!

Tools and equipment

For a list of my go-to tools and equipment, I have a post you can refer to here.

Why is this recipe in grams?

I post my recipes in grams as it is the most accurate way to bake. Cups are not only inaccurate but they vary in volume worldwide. There is no way for me to provide one cup measure that works for everyone. However, posting in weight fixes this issue. If you would like the recipe in cups you are welcome to convert it yourself via google, but please do not ask me to do it for you as I am not comfortable providing a recipe using a method that I have not tested. Baking with a scale is easy, accurate, and also makes cleanup super simple. Here is the scale that I use if you would like a recommendation! Here's to accurate baking!

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