These homemade cookies are an ideal after school snack but can be enjoyed any time! Creamy marshmallow filling is embraced by two soft chocolate cookies, creating an irresistible treat.
Preheat oven to 400°F. Prepare two parchment-lined baking sheets and set aside.
Mix the wet ingredients: In an electric mixer, cream the butter and granulated sugar until light and fluffy, 3-5 minutes. Mix in the egg, vanilla extract, and espresso powder until completely combined.
In a separate bowl, mix the dry ingredients: Sift together the flour, baking powder, baking soda, salt, and cocoa.
2 cups all-purpose flour, ½ teaspoon baking powder, 1 ½ teaspoons baking soda, ½ teaspoon kosher salt, ½ cup Dutch-process cocoa powder
Combine: Alternately add dry ingredients with the milk, beginning and ending with dry. Scrape the bowl to ensure the mixture is combined, and drop by the teaspoon onto the prepared baking sheets.
1 cup whole milk
Bake in the preheated 400°F oven for 8-10 minutes until puffed and set in the center. Remove from the oven and cool.
Make the creme filling: Combine the marshmallow creme, shortening, vanilla extract, and powdered sugar. Mix to combine, and add enough heavy cream to smooth the filling to a spreadable consistency.
1 jar (7 ounces) marshmallow creme, ½ cup vegetable shortening, 1 teaspoon vanilla extract, 2 cups sifted powdered sugar, 2-3 tablespoons heavy cream
Assemble: Spread 1 teaspoon of filling on the bottom of one cookie and place another cookie on top, creating a sandwich.