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–+ servings
Three oatmeal cream pies are stacked on a white plate, filled with white cream, with a glass of milk, cinnamon sticks, and wooden spoons nearby on a wooden tray.
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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.
Course Dessert
Cuisine American
Keyword Oatmeal Bars, Oatmeal Cream Pie, Oatmeal Cream Pie Bars
Prep Time 15 minutes
Cook Time 12 minutes
Freezer Time 1 hour
Total Time 1 hour 27 minutes
Servings 20
Author Heidi Bruaw

Ingredients

  • 1¼ Cup Unsalted Butter room temperature
  • ¾ Cup Dark Brown Sugar
  • ½ Cup Sugar
  • 1 teaspoon Vanilla Extract
  • 2 Eggs
  • 1½ Cup Flour
  • 1 teaspoon Cinnamon
  • 1 teaspoon Salt
  • 1 teaspoon Baking Soda
  • 1½ Cup Quick Oats
  • 1½ Cup Old-Fashioned Oats

Filling

  • ¾ Cup Unsalted Butter room temperature
  • 2 Cups Powdered Sugar
  • 13 ounces Marshmallow Fluff
  • 1 teaspoon Vanilla Extract

Instructions

  • Preheat the oven to 350℉.
  • Line two 9"x13" baking dishes with parchment paper and spray with nonstick cooking spray. Set aside.
  • Add 1¼ Cups of butter, brown sugar, and sugar to a large mixing bowl. Beat with a hand mixer until light and creamy.
  • Add 1 teaspoon of vanilla and eggs and beat until completely combined.
  • Add the flour, cinnamon, salt, and baking soda to a large mixing bowl and stir.
  • Add the flour mixture to the brown sugar mixture and beat until everything is mixed together.
  • Add the quick oats and the old-fashioned oats and beat the mixture again.
  • 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.
  • 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.
  • Bake at 350℉ for 13 minutes or until golden brown.
  • 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.
  • Add the powdered sugar and beat again until it's completely combined.
  • Add the marshmallow fluff and 1 teaspoon of vanilla extract and beat again.
  • 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.
  • 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.
  • Place in the freezer for at least 1 hour.
  • Take out of the freezer and slice into bars.