Stack of oatmeal cookies with peanut butter filling in a tin container

Oatmeal Cookies with Peanut Butter Filling

Oatmeal Cookies with Peanut Butter Filling are a Girl Scout Do-Si-Do copycat recipe! 
Course Dessert
Cuisine American
Prep Time 20 minutes
Cook Time 10 minutes
Total Time 30 minutes
Servings 16 cookie sandwiches
Calories 271kcal
Author I Heart Eating



  • 1/2 cup butter at cool room temperature
  • 3/4 cup brown sugar packed
  • 1/4 cup granulated sugar
  • 1 large egg
  • 1 teaspoon vanilla extract
  • 1 ¾ cups rolled oats
  • 1 cup all-purpose flour
  • 1/2 teaspoon baking powder
  • 1/2 teaspoon baking soda
  • 1/4 teaspoon salt


  • 2 tablespoons butter at room temperature
  • 1/2 cup + 2 tablespoons smooth peanut butter1
  • 1 cup powdered sugar
  • 1/2 teaspoon vanilla extract
  • 1/8 teaspoon salt
  • 3 tablespoons milk


  • Preheat oven to 350 F. Line two large baking sheets with parchment paper or silicone baking mats; set aside.
  • In the bowl of a stand mixer fitted with a paddle attachment, beat butter and sugars together until light and creamy.
  • Beat in the egg until well-combined.
  • Stir in the vanilla extract until combined.
  • Add the oats, flour, baking powder, baking soda, and salt to the butter mixture, stirring on low speed until just incorporated.
  • Drop cookies by tablespoonful onto prepared baking sheets, spacing dough about 2-inches apart.
  • Bake for 10-15 minutes, or until they’re golden brown.
  • Allow cookies to cool on the cookie sheet for 5 minutes.
  • Then transfer to a wire rack to cool completely before filling.
  • To prepare the filling, beat together butter, peanut butter, and powdered sugar in the bowl of a stand mixer fitted with the paddle attachment.
  • Stir in vanilla extract.
  • Add milk, and beat to combine. Filling should be at a spreadable consistency.
  • Once cookies are cool, turn half cookies flat side up.
  • Spread those cookies with peanut butter filling.
  • Top filling with another cookie.


  1. Not natural peanut butter
  2. Nutrition facts are estimates.


Serving: 1serving | Calories: 271kcal | Carbohydrates: 36g | Protein: 5g | Fat: 12g | Saturated Fat: 5g | Cholesterol: 29mg | Sodium: 245mg | Potassium: 149mg | Fiber: 1g | Sugar: 21g | Vitamin A: 240IU | Calcium: 30mg | Iron: 1.1mg