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The BEST Oatmeal Cream Pies with Vanilla Buttercream

Taralynn
The ultimate oatmeal cream pie recipe with marshmallow vanilla buttercream.
5 from 23 votes
Print Recipe Pin Recipe
Prep Time 20 minutes
Cook Time 30 minutes
Total Time 50 minutes
Course Dessert
Servings 12 Cookies

Ingredients
  

Oatmeal Cookie Ingredients
  • 2 1/2 Cups All-Purpose Flour
  • 3 Cups Old Fashioned Oats
  • 1 1/2 Teaspoon Baking Soda
  • 3/4 Teaspoon Baking Powder
  • 1/2 Teaspoon Sea Salt
  • 2 Teaspoons Ground Cinnamon
  • 1 Cup +1 Tbsp Unsalted Butter (room temperature)
  • 1 1/2 Cups Packed Brown Sugar
  • 1/4 Cup Molasses
  • 2 Large Eggs
  • 2 Teaspoons Vanilla Extract (pure vanilla)
Vanilla Marshmallow Buttercream Filling Ingredients
  • 1/2 Cup Unsalted Butter (room temperature)
  • 7 Ounces Marshmallow Cream
  • 2 1/4 Cups Powdered Sugar
  • 1 1/2 Teaspoon Vanilla Extract (pure vanilla)

Instructions
 

Oatmeal Cookie Instructions

  • Preheat Oven to 350 Degrees
  • In a large bowl, sift together: flour, oats, baking soda, baking powder, salt, and cinnamon. 
  • In an electric mixer, combine the butter and brown sugar on medium speed until light and fluffy.
  • Mix in the molasses, vanilla, and egg on low speed. 
  • Keep the mixer on low speed and slowly add in the dry ingredients. Increase the speed gradually until combined. 
  • Line a baking sheet with parchment paper, add 90 gram-sized cookie balls onto the pan three inches apart. Press the dough balls down slightly forming a cookie shape.
  • Bake 8-10 minutes. They'll be lightly brown around the edges and soft in the center. They'll continue to cook once you take them out of the oven. 
  • Use a spatula to transfer the cookies to a cooling rack. 

Vanilla Marshmallow Buttercream Filling

  • Add the butter, vanilla, and marshmallow cream to the electric mixer and combine on medium speed. (Make sure there are no chunks of butter.)
  • Slowly add the powdered sugar and mix on very low speed.
  • Once the powdered sugar is combined, whip the filling on high-speed for twenty seconds. 
  • Flip the oatmeal cookies upside down with the flat surface facing up, and frost it with about two tablespoons. (I usually add one tablespoon to each cookie bottom) Add another cookie to make a sandwich. 
Keyword oatmeal cream pies, oatmeal cookies, vanilla buttercream
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