Biscoff Sandwich Cookies are made up of two Biscoff-flavored oatmeal cookies and a creamy Biscoff filling. They’re sweet and indulgent and absolutely perfect for anyone who loves cookie butter!
Preheat oven to 350°F. Line cookie sheets with parchment paper.
In the bowl of a stand mixer fitted with the paddle attachment or in a large bowl with an electric mixer, cream together 1/2 cup butter, 1/2 cup Biscoff spread until light and fluffy - about 2 minutes. Gradually add in sugar, brown sugar, and vanilla, mixing until well combined. Add egg and beat well.
In another bowl, combine flour, baking soda, baking powder, and salt. Add dry ingredients to the creamed mixture. Stir. Add oatmeal, mixing until well combined.
Use a medium cookie scoop and drop dough onto prepared baking sheet. Bake in preheated oven for 10 minutes, or until cookies are a light brown. Allow cookies to cool on pan for 5 minutes before moving them to a wire rack to cool completely.
To Make Filling: Cream together 3 tablespoons butter 1/2 cup Biscoff spread. Gradually add in confectioners' sugar, mixing until creamy and thoroughly combined. Add in cream and beat for 1 minute. Spread filling onto half of the cooled cookies, then top with the other half to form sandwiches.