- VE
Oatmeal Cream Pie Bars
These Oatmeal Cream Pie Bars taste like those classic lunchbox snacks, just bigger, softer, and way more fun. You get chewy oatmeal cookie layers with a fluffy marshmallow filling in the middle that’s hard to resist. They’re super easy to make and even harder to stop snacking on.

Ingredients
Filling
Instructions
- Step 1
Preheat the oven to 350℉.
- Step 2
Line two 9"x13" baking dishes with parchment paper and spray with nonstick cooking spray. Set aside.
- Step 3
Add 1¼ Cups of butter, brown sugar, and sugar to a large mixing bowl. Beat with a hand mixer until light and creamy.
- Step 4
Add 1 teaspoon of vanilla and eggs and beat until completely combined.
- Step 5
Add the flour, cinnamon, salt, and baking soda to a large mixing bowl and stir.
- Step 6
Add the flour mixture to the brown sugar mixture and beat until everything is mixed together.
- Step 7
Add the quick oats and the old-fashioned oats and beat the mixture again.
- Step 8
Scoop half the mixture into one of the lined 9"x13" baking dishes. Add the other half of the mixture to the other 9"x13" baking dish.
- Step 9
Spray your hands with nonstick cooking spray and flatten the dough with your hands. Spread the dough evenly out to the corners of each dish.
- Step 10
Bake at 350℉ for 13 minutes or until golden brown.
- Step 11
While waiting for the bars to cool, make the cream. Add the ¾ cup butter to a large bowl and beat with a hand mixer until light and creamy.
- Step 12
Add the powdered sugar and beat again until it's completely combined.
- Step 13
Add the marshmallow fluff and 1 teaspoon of vanilla extract and beat again.
- Step 14
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 place the parchment paper lined bar on a tray or sheet pan.
- Step 15
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 the bar on top of the cream and lightly press down.
- Step 16
Place in the freezer for at least 1 hour.
- Step 17
Take out of the freezer and slice into bars.
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Hello! My name is Heidi, aka Lulu, and I started this blog in July of 2018. I share recipes and kitchen tips as well as current food trends. Real Life of Lulu is more than just recipes. It’s a place for food enthusiasts to gather and share their kitchen triumphs and new discoveries (whether from old cookbooks or new). Ask questions, share your wins, and encourage each other.
Per serving
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