An Oatmeal Cookie Sandwich Recipe That’s Better Than Anything You’ll Find in a Package

Oatmeal Cookies with Marshmallow Cream Filling

Neurotic Baker

Typically when I make oatmeal cookies, I use whole rolled oats and lots of them. They give a nice hearty texture. At least, that’s what my friends say. While I love oatmeal cookies, I always dreamed of them not being so, well, hearty.

It is for this reason why I was in awe of the iced oatmeal cookies I made a while back. The recipe called for quick-cooking oats and I ground them in the food processor. I can’t believe I never thought of this before. I loved the texture! They were still soft, and hearty, but without all of the large oat bits. Side note: I don’t like pulp in my orange juice if this helps to understand my texture issues with whole oats.

I really wanted to try this process again, but didn’t want to just make oatmeal cookies. Then I thought of Little Debbie. Those were the best and sweetest oatmeal sandwich cookies ever. I decided that I would try to make my own oatmeal cookies with a marshmallow cream filling.

One word: success! They were great and really reminded me of Little Debbie. I wish I made my cookies a little thinner, but that didn’t stop my friends and I from eating them all!


Neurotic Baker

Oatmeal Sandwich Cookies with Marshmallow Cream Filling


For the cookies

1 ¼ cups unsalted butter (2.5 sticks), softened to room temperature
1 cup dark brown sugar
½ cup granulated sugar
1 large egg
2 teaspoons vanilla extract
1 tablespoon dark molasses
1 ½ cups all-purpose flour
1 teaspoon baking soda
½ teaspoon salt
¾ teaspoon ground cinnamon
¼ teaspoon ground cloves
3 cups uncooked quick-cooking oats

For the filling

½ cup (1 stick) unsalted butter, softened
1 (7 1/2 ounce) jar marshmallow fluff or cream
1 cup confectioners’ sugar
½ teaspoon vanilla
Heavy cream (as needed)
Dash of salt


Make the cookies

1. Place the oats in a food processor or blender and pulse until the oats are ground, but not fine. Set aside.
2. With a stand or handheld mixer, cream the butter and sugars together at medium speed until light and creamy. Add egg, vanilla, and molasses, scraping down the sides as needed. Set aside.
3. In a medium-sized bowl, combine the flour, baking soda, salt, cinnamon, and cloves. Whisk it all around. Add the quick oats and combine.
4. With the mixer running on low, slowly add the dry ingredients to wet ingredients. The dough will be quite thick and you may have to mix it all by hand after a few seconds in the mixer.
5. Preheat oven to 375°F. Line a large cookie sheet with parchment paper or nonstick baking mat. Drop dough with a large cookie scoop, or make sure each ball of dough is 3 tablespoons in measurement. Cookies will spread in the oven, so drop each ball of dough 2 inches apart. Flatten the tops of the cookie dough slightly.

6. Bake for 10 minutes, until cookies are lightly golden around the edges. Allow cookies to cool on cookie sheet for 3 minutes before transferring to a wire rack to cool completely.

Make the filling

1. Beat butter in a large bowl with mixer on high speed until creamy.

2. Beat in marshmallow fluff or cream. Reduce speed to low, and beat in confectioners’ sugar and vanilla.

3. Increase speed to high; beat until fluffy. If the filling is too stiff, you can add a little heavy cream.

Assemble the cookies

Spread approximately 1 to 2 tablespoons of filling on the bottom half of the cookie and top with another cookie. Repeat. Enjoy!

Neurotic Baker

Neurotic Baker

Cheryl Vivian is a neurotic baker who came to D.C. via Detroit, Chicago, and New York City. She likes to get nerdy about baking, and there are at least two dozen eggs, four pounds of butter, and a quart of buttermilk in her fridge at all times. She doesn’t cry over burnt cookies, sunken cakes, or tough pie dough, but she will try (and try) until it’s just right. Cheryl loves to blend new trends with traditional recipes and believes that everything is better with a pinch of salt. Follow along on Instagram at @cherylvivian.