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Homemade Oatmeal Whoopie Pies

These homemade oatmeal whoopie pies feature sweet, fluffy, vanilla buttercream sandwiched between two thick and chewy oatmeal cookies!
Prep Time15 mins
Cook Time12 mins
Chilling and Cooling Times40 mins
Total Time1 hr 7 mins
Course: Dessert
Cuisine: American
Keyword: cookie sandwiches, Homemade Oatmeal Cream Pies, homemade oatmeal whoopie pies, homemade whoopie pies, oatmeal whoopie pies
Servings: 18 Servings
Calories: 423kcal


Oatmeal Cookies

  • 1 Cup Unsalted Butter (softened)
  • 1 Cup Brown Sugar (packed)
  • 1 Cup Granulated Sugar
  • 2 Large Eggs
  • 2 Teaspoons Vanilla Extract
  • 2 Cups All-Purpose Flour
  • 2 Teaspoons Cinnamon (ground)
  • 1 Teaspoon Baking Soda
  • 1/2 Teaspoon Salt
  • 3 Cups Quick Oats

Buttercream Filling

  • 2 1/2 Cups Powdered Sugar
  • 3/4 Cup Unsalted Butter (softened)
  • 1 Tablespoon Milk
  • 1 Teaspoon Vanilla Extract


Make the Cookies

  • In a large bowl, use a hand mixer to beat together the butter, brown sugar, and granulated sugar until light and fluffy. Add the eggs and vanilla, and beat until combined. Set aside.
  • In a separate medium bowl, whisk together the flour, cinnamon, baking soda, and salt. Add the dry ingredients to the butter mixture and mix on low speed just until no flour streaks remain. Pour in the oats and mix on low until combined. Cover the bowl with plastic wrap and refrigerate for at least 30 minutes. Meanwhile, line two baking sheets with parchment and preheat the oven to 350° degrees.
  • After the dough chills, roll the dough into tablespoon-sized balls (ping pong-sized ball) and gently press it down, so it’s no longer rounded on the top. Place the dough on the baking sheets 2-inches apart.
  • Bake for 10 to 12 minutes or until the edges are very light brown. The centers will still be soft. Remove from the oven and allow the cookies to cool on the baking sheets before transferring to a wire rack to cool completely. While the cookies cool, make the filling.

Whoopie Pie Filling

  • In a medium bowl, use a hand mixer combine the powdered sugar, butter, milk, and vanilla. Mix until the filling is smooth and creamy. Add a teaspoon or two extra milk if necessary to thin out the filling. The filling should be spreadable but not too thin.
  • After the cookies cool, use a piping bag with a large, circular tip to place filling on the bottom of the cookie. Add a second cookie on top of the filling to form a sandwich.
  • Store the finished oatmeal cream pies in the refrigerator for up to 4 to 5 days.



The calories listed are an approximation based on the ingredients and a serving size of 1 whoopie pie. Actual calories will vary. The cookie sandwiches can be stored in a sealed container, in your fridge, for up to 4 days.


Serving: 1Whoopie Pie | Calories: 423kcal | Carbohydrates: 60g | Protein: 4g | Fat: 20g | Saturated Fat: 12g | Cholesterol: 68mg | Sodium: 296mg | Potassium: 92mg | Fiber: 2g | Sugar: 40g | Vitamin A: 582IU | Calcium: 30mg | Iron: 1mg
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