Cookie Bars are so much easier to make than rolling and cutting out individual cookies. I absolutely love cookies, but sometimes it just feels like a lot of work to scoop and bake dozens of cookies and fill each cookie sandwich individually. The solution? Cookie bars! Just put the dough in two 9X13 pans and bake the whole batch at one time!

OATMEAL CREAM PIE BARS

The first step in making Oatmeal Cream Pie Bars is to make the oatmeal cookie dough with basic ingredients, including a combination of quick and rolled oats. The dough is divided evenly into two 9X13 pans and then baked. Once the layers are cooled, the filling is made with marshmallow fluff, butter, and powdered sugar. Spread the filling on one oatmeal cookie layer and then place the other cookie layer on top. Slice into bars and serve.

Ingredients in Oatmeal Cream Pie Bars

OATMEAL COOKIE LAYERS

Butter – Real butter works best. Make sure it is softened to room temperature before mixing with the other ingredients.

Sugars – You will need brown sugar and granulated sugar. Make sure the brown sugar is soft and fresh.

Vanilla extract – The higher the quality of the vanilla, the better.

Eggs – Two large eggs will bind the other ingredients together.

Flour – All-purpose flour is best, but a gluten-free substitute will work also.

Cinnamon – Cinnamon makes oatmeal even better.

Salt – A little bit of salt helps all of the other flavors to pop.

Baking soda – This is the leavening agent in the cookies. For best results, make sure that the baking soda isn’t old or expired.

Oats – Using a combination of quick oats and old-fashioned oats gives the cookie layers the most amazing texture and consistency.

MARSHMALLOW CREAM FILLING

Butter – Again, real butter works best. I use salted butter just because that’s what I use for everything, but unsalted works fine too.

Powdered sugar – The powdered sugar adds most of the sweetness, while keeping a smooth texture for the creamy filling.

Marshmallow cream – Sometimes called Marshmallow Fluff. Can be found in the baking aisle and I love the way that it makes the consistency of the filling so perfect.

Vanilla extract – The higher the quality of the vanilla, the better. 

HOW TO MAKE OATMEAL CREAM PIE BARS

Preheat the oven and line two 9×13 baking dishes with parchment paper and spray them with nonstick cooking spray.

MAKE THE OATMEAL COOKIE LAYERS

Add the butter, brown sugar, and sugar to a large bowl and beat with a hand mixer until light and creamy (about 2-3 minutes).

Add the eggs and vanilla and beat for 2-3 more minutes.

In another large bowl, mix the flour, cinnamon, salt, and baking soda.

Add the dry ingredients to the wet mixture and mix just until combined.

Add the oats to the bowl and mix just until combined.

Spread the mixture evenly in the two prepared pans.

Bake for 13 minutes or until golden brown. 

MAKE THE CREAM FILLING

Beat the filling ingredients together.

Spread the filling on one cookie layer before inverting the other cookie layer on top. Freeze for an hour and then slice into bars.

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Oatmeal Cream Pie Bars

Oatmeal Cream Pie Bars taste just like Oatmeal Creme Pies with marshmallow cream filling sandwiched between two soft and chewy oatmeal cookie layers. Delicious sandwich cookie bars that are so easy to make!

Course Cookies, Dessert

Cuisine American

Keyword Oatmeal Cream Pie Bars

Prep Time 15 minutes minutes

Cook Time 12 minutes minutes

Chill Time 1 hour hour

Servings 20 servings

Calories 404kcal

Author Jessica & Nellie

Ingredients

OATMEAL COOKIE LAYERS

• 1 ¼ cups butter softened to room temperature
• ¾ cup brown sugar
• ½ cup sugar
• 1 tsp vanilla extract
• 2 eggs
• 1 ½ cups flour
• 1 tsp ground cinnamon
• 1 tsp salt
• 1 tsp baking soda
• 1 ½ cups quick oats
• 1 ½ cups old-fashioned oats

MARSHMALLOW CREAM FILLING

• ¾ cup butter softened to room temperature
• 2 cups powdered sugar
• 13 oz marshmallow fluff
• 1 tsp vanilla extract

Instructions

• Preheat the oven to 350°. Line two 9×13 baking dishes with parchment paper and spray with nonstick cooking spray.

MAKE THE OATMEAL COOKIE LAYERS

• In a large bowl add the 2 ½ sticks of butter, brown sugar, and sugar and beat with a hand mixer until light and creamy (about 2-3 minutes).
• Add the eggs and vanilla and beat for 2-3 more minutes.
• In another large bowl, mix the flour, cinnamon, salt, and baking soda. Add the dry ingredients to the wet mixture and mix just until combined. Add the quick oats and old-fashioned oats to the bowl and mix just until combined.
• Scoop half the mixture into one of the lined 9×13 baking dishes and the rest into the other 9×13 and spray your hands with nonstick cooking spray. Flatten the dough with your hands, spreading evenly all the way to the corners of the baking dish.
• Bake for 13 minutes or until golden brown.

MAKE THE CREAM FILLING

• Let the bars cool while you make the cream. Add the butter to a large bowl and beat using the hand mixer until light and creamy. Add the powdered sugar and beat again until well mixed. Add the marshmallow fluff and vanilla and beat again until smooth.
• The bars must be completely cool before spreading the cream on top. Lift one of the bars out of the dish by lifting the parchment paper up and then placing the parchment paper lined bar on a tray or sheet pan. Spread the cream all over the top of the oatmeal bar. Lift the other bar out of the baking dish by the ends of the parchment paper. Carefully flip that bar on top of the cream and lightly press down.
• Place in the freezer for 1 hour. Take out and slice into bars, serve, and enjoy!

Nutrition

Calories: 404kcal | Carbohydrates: 56g | Protein: 3g | Fat: 20g | Saturated Fat: 12g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 5g | Trans Fat: 1g | Cholesterol: 65mg | Sodium: 327mg | Potassium: 78mg | Fiber: 1g | Sugar: 36g | Vitamin A: 591IU | Vitamin C: 0.004mg | Calcium: 23mg | Iron: 1mg

TIPS FOR MAKING THE BEST COOKIE BARS

• Do not melt the butter! The butter needs to be softened (at room temperature), but using melted butter will ruin the cookies.
• Spend a little extra time when you mix the butter and sugars. Creaming them together for 2-3 minutes will improve the consistency of your cookies.
• Preheat the oven. This will help your cookies turn out right every time!
• Use parchment paper. Doing this will make it much easier to remove the cookies from your pan.
• Make sure not to overbake your cookie bars.  Once the edges begin to turn even the lightest golden brown, take them out of the oven! I prefer to err on the side of being slightly undercooked for cookies because if they cook even a little bit too long, they can get hard and I love soft cookies!

HOW DO YOU SOFTEN BUTTER?

I like to soften butter by using the defrost function on my microwave. If you need the full 1/2 cup cube of butter, you can leave it in the paper wrapper, otherwise, place the amount of butter you need in a glass or porcelain bowl. I use the lowest defrost setting on my microwave and just let it run for 20 seconds. Check the butter and see how soft it is by pressing it with a rubber scraper. If it is still not soft to the touch, meaning it doesn’t indent when you press into it, let it warm for another 5-10 seconds. Watch it closely! Butter softens very quickly.

How to store Oatmeal Cream Pie Bars?

Place the Oatmeal Cream Pie Bars in an airtight container in the refrigerator for up to 4-5 days. They stay fresh and taste better if stored in the refrigerator, but I think they taste better when closer to room temperature, so I set them out about 30-45 minutes before eating. Well, I try to wait that long. Let’s be honest…they taste pretty good straight out of the fridge too!

HOW TO CUT PERFECT COOKIE BARS

The answer to getting every single cookie bar cut and looking perfect is parchment paper! I used to always get frustrated with desserts that were made in a 9X13 or sheet pan because I felt like I was always destroying the entire first row trying to get them out of the pan! Then I discovered that if you use parchment paper, you can remove all the cookie bars from the pan and slice them perfectly. Parchment paper is especially important for this recipe because you have to remove the cookie bars from the pans to be able to assemble them with the filling.

LIKE COOKIE BARS? HERE ARE SOME OF OUR FAVORITE BAR COOKIE RECIPES!

• Strawberry Cheesecake Cookie Bars
• Snickerdoodle Cookie Bars
• Sugar Cookie Bars
• Chocolate Chip Cookie Bars
• No Bake Cookie Bars
• Oatmeal Chocolate Chip Cookie Bars
• Lemon Sugar Cookie Bars
• Swirled Patriotic Cookie Bars
• Fudgy Oatmeal Cookie Bars
• Twix Cookie Bars
• Easy Peanut Caramel Cookie Bars
• Gingerbread Cookie Bars
• Butterscotch Pretzel Cookie Bars
• Reese’s Cookie Bars
• S’mores Cookie Bars
• Oreo Cookie Bars

Oatmeal Cream Pie Bars taste just like Oatmeal Creme Pies with marshmallow cream filling sandwiched between two soft and chewy oatmeal cookie layers.

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