Oatmeal Marshmallow Chocolate Chip Cookies are buttery oatmeal cookies dotted with chocolate chips and stuffed with marshmallows for a fun twist on a classic!

These oatmeal cookies are everything you love about traditional cookies with added chocolate chips and mini marshmallows!
Highlights of this Oatmeal Cookie Recipe:
- Two kinds of chocolate chips adds that fantastic chocolate flavor in every bite!
- Hello, we stuffed the cookies with mini marshmallows. You’ll love it.
- Balanced texture and flavor by using both butter and shortening. Soft, chewy middles and slightly crisp edges- YUM.
Marshmallow Oatmeal Cookie Ingredients
Fats/moisture: We use both butter and shortening in this cookie recipe.
Sugars: Give the cookies a wonderful depth of flavor by adding brown sugar and granulated sugar.
Eggs: Bind the ingredients together with 2 eggs.
Vanilla extract: Enhance the flavors by adding vanilla extract to the dough.
Flour: The structural base of this cookie dough is 2 ¼ cup of flour.
Baking soda: The leavening agent in this recipe is 1 tsp of baking soda.
Salt: Add ¼ tsp of salt to the cookie dough.
Oats: For amazing texture and taste, add a cup of old-fashioned oats.
Chocolate chips: You will need semisweet chocolate chips and mini chocolate chips for this recipe.
Marshmallows: Adding miniature marshmallows creates gooey, sweet cookies.

Quick Tips for the best Oatmeal Marshmallow Chocolate Chip Cookies
Full steps for making these cookies is in the recipe card below, here are just a few tips to note:
- Use parchment paper. A trick when making marshmallow cookies is to line your baking sheet with parchment paper for easy removal and clean-up! Marshmallows can be sticky!
- Use the oats you have on hand. I like the texture that old fashioned oats gives these cookies, but I am all for using what you already have!
- Shape & stuff. Make sure to fully enclose the marshmallows in the cookie dough to ensure you achieve the pockets of gooey-deliciousness. Flattening the dough a bit and wrapping the mini-marshmallows inside helps them to bake beautifully.

Oatmeal cookie Storage & Freezing
These oatmeal chocolate chip cookies will stay fresh for up to 5 days if stored in an airtight container at room temperature.
For longer storage, place them in an airtight container or freezer bag and freeze for up to 3 months. Thaw the cookies at room temperature before serving.
What adjustments should I make if I’m using only butter?
When using only butter, the texture may be slightly different. Butter provides more flavor but less stability compared to shortening. To maintain the desired texture, consider chilling the dough before baking.
Can I substitute quick oats for old-fashioned oats?
Quick oats can be used as a substitute for old-fashioned oats. However, the texture will be softer and may not have the same chewy quality. The cookies might spread more during baking.

What’s the best way to ensure my cookies are chewy?
To achieve a chewy texture, avoid overbaking the cookies. Removing them from the oven while they are still soft in the center will help maintain moisture. Using both types of chocolate chips also adds to the overall chewiness.
What causes oatmeal cookies to become hard?
Oatmeal cookies can become hard for several reasons. One of the main reasons is overbaking. When oatmeal cookies are baked for too long, they can become dry and hard. Another reason is using too much flour or not enough moisture in the dough. This can cause the cookies to be dry and crumbly, leading to a hard texture. Storing oatmeal cookies in an airtight container can also cause them to become hard over time.

Give more of our favorite oatmeal cookie recipes a try here:
- These oatmeal toffee pecan cookies combine the chewy texture of oatmeal, with the buttery flavor of toffee, and round out the cookie with a perfect nutty crunch of pecans.
- Looking for something a bit more decadent? We’ve got you covered with this recipe for double chocolate oatmeal cookies.
- Love mixing different tastes & textures? Well here is a great recipe to try, our coconut oatmeal cookies are loaded with sweet chocolate chips, coconut flakes & chewy oats!
- Whip up a batch of these oatmeal walnut chocolate chip cookies with a few simple pantry ingredients and you’ll have a soft, gooey cookies in no time.
- Our recipe for chewy iced oatmeal cookies is a homemade version of a classic store-bought treat.
- Looking for a single serving dessert? Make this oatmeal chocolate cookie in a mug in less than a minute in the microwave.
Oatmeal Marshmallow Cookies are a delicious and unique twist on a classic oatmeal cookie. The added chocolate and marshmallows is amazing!
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