
Two soft oatmeal cookies with a creamy sweet frosting sandwiched in between. These are classic yet homemade Oatmeal Cream Pies!
Preheat oven to 325 degrees. Line two light-colored baking sheets with parchment paper and set aside
In the bowl of a stand mixer, stir marshmallow fluff, butter, powdered sugar and vanilla together until it starts to come together. Give it some time to incorporate to a thick paste. Add milk sparingly 1 teaspoon at a time until you have a thick and creamy filling that will hold its shape. Transfer to a piping bag with a large round tip (I used the Wilton 1A).
Match cooled cookies together with similar sized partner cookies. Pipe about 2 tablespoons of marshmallow frosting onto the center of the bottom of a cookie. Press matching cookie onto the frosting to push filling towards the edges. Continue filling cookies until all 18 oatmeal cream pies are filled. Enjoy at room temperature.