Oatmeal cream pie bars will remind you of the Little Debbie oatmeal creme pies you used to get in your lunchbox. The chewy oatmeal cookie base is topped with a marshmallow fluff frosting. The combination is a delicious taste of nostalgia.
These chewy oatmeal cookie bars are rich with deep molasses flavor and topped with marshmallow fluff buttercream for the perfect treat. These bars come together super quickly, and can be in the oven in under 10 minutes.
Then a quick marshmallow fluff frosting layer is spread over to make them out of this world good. They are just like those Little Debbie treats we all grew up on!
If these don’t bring back childhood memories of sack lunches, I don’t know what will. Actually, to tell you the truth I am not sure that I frequently had these in my lunch box.
I seem to think I ate school lunch most of the time. Though I do know that when I was older, my mom always had a treat basket for my younger siblings’ lunches.
They seemed to bring cold lunch more often and they got to pick one item from the treat basket for their lunch box. Of course the treats were the best part of the lunch packing (and eating) experience!
Why You’ll Love These Cookie Bars
These cookie bars are easy to make. You don’t have to worry about them spreading, so you can start with melted butter and soft dough.
You can mix it by hand with no problem, no need to pull out the stand mixer or anything! Just spread it, bake it and load it with frosting!
There is the warm depth of molasses and just a slight cinnamon spice. It is a great compliment to the marshmallow fluff buttercream frosting.
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In fact, the molasses and creamy frosting combine to make almost a caramel flavor. And the chew of the cookie is so good.
I originally shared this recipe here on the site back in 2016. I made them for a football party and they were a hit.
But most of you didn’t know I existed back in 2016 and I have been dreaming of these bars for the past couple of months. So I whipped some up, shot some new pictures and a video and added a printable recipe card so you could more easily make them too.
And I really hope you do. These went with me to family dinner and everyone kept going back for a little more.
They also lead to a lot of fun conversation about our favorite packaged treats. What are your favorite convenience treats?
It would be fun to make more copycat versions of stuff. Just let me know what you’d like and we’ll see what we can come up with!
Can I use old fashioned oats instead of instant?
If you only have old fashioned oats in your pantry, go ahead and use them. The texture of the oatmeal cream pie cookie bars may be slightly chewier, but they will still be delicious.
Oatmeal Cream Pie Bars
Ingredients
Molasses Oatmeal Cookie Bars
- 1 cup butter melted
- 2 cups light brown sugar packed
- 4 Tablespoons molasses
- 1 Tablespoon vanilla extract
- 2 large eggs
- 1 teaspoon ground cinnamon
- ½ teaspoon salt
- 2 cups instant oats
- 1½ cups all-purpose flour
- 1 teaspoon baking powder
Marshmallow Fluff Buttercream
- 1 cup butter softened
- 2 cups powdered sugar
- 1 teaspoon vanilla extract
- 7 ounces marshmallow fluff
Instructions
Oatmeal Cookie Bars
- Preheat oven to 350°F and grease a 10×15-inch bar pan.
- Stir together butter, brown sugar, molasses, and vanilla.1 cup butter, 2 cups light brown sugar, 4 Tablespoons molasses, 1 Tablespoon vanilla extract
- Add eggs and mix well.2 large eggs
- In another bowl, stir together dry ingredients.1 teaspoon ground cinnamon, ½ teaspoon salt, 2 cups instant oats, 1½ cups all-purpose flour, 1 teaspoon baking powder
- Add dry ingredients to wet ingredients, stirring until just combined.
- Spread in prepared pan and bake for 25-30 minutes or until set.
- Allow to cool completely before frosting.
Marshmallow Fluff Buttercream
- In mixing bowl, beat butter until light and fluffy.1 cup butter
- Add remaining ingredients and mix on medium speed for 4 minutes.2 cups powdered sugar, 1 teaspoon vanilla extract, 7 ounces marshmallow fluff
- Spread over cooled bars. Decorate with sprinkles if desired.
- Cut into squares and enjoy.
Notes
Video
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These look absolutely divine! My family loves oatmeal cream pies so I think they would be over the moon for these! Have a beautiful weekend!
They are sooooooooo good! Thank you!
Oh these look like a great treat. Molasses is not something that we use here but I like the sound of it!
I usually only use it in gingerbready type recipes, but it added the perfect flavor to these oatmeal bars. I need to experiment with it more!
Hi Carlee,
Yum! I wish my mom put these in my lunch when I was a kid! I guess I can start putting them in my boys lunches when they are old enough to go to school. Thanks for sharing these delicious bars with us at #TalentedTuesday.
Cheers,
AJ
Sometimes I get carried away thinking about all of the fun things we'll do with LD when he is a bit older. Sometimes the thought of him getting older and going off to school makes me sad! We like to make treats for daycare though, so that is good enough for now! In fact, he and I have a cookie baking date for tonight! Have a wonderful evening!
Yum these totally take me back! Congrats on your feature at #OvertheMoon! 🙂
Thank you!
These look amazing!
Thank you!
Oatmeal and marshmallow is such a wonderful combination, these bars sound delicious! Thanks for sharing at What'd You Do This Weekend?!
Thank you! We really enjoyed how the dark chewy molasses and oatmeal played against the fluffy white frosting!
These look sweet! I bet the molasses and cinnamon add such a wonderful flavor too. 🙂
The molasses and cinnamon really help warm up the flavor!
I've never had this type of bars. Will have to give this a try. Thanks for sharing on Merry Monday.
Thank you! I love the flavor of the molasses with the oatmeal.
This looks and sounds so delicious and healthy too.
Thanks Carlee for joining and sharing your awesome recipes with us each week at Cooking & Crafting with J & J.
Better than the ones in the packages at least!
Yum! Thanks for sharing at Funtastic Friday!
Thanks for stopping by!