S'mores Cookie Sandwiches are made with graham cracker chocolate chip cookies and a simple marshmallow filling. Even if you don't love s'mores, you will love these cookie sandwiches!
In a large bowl, cream butter and sugars together for 2-3 minutes. Add egg, vanilla and milk and beat for 2-3 more minutes.
In a separate bowl, mix the flour, graham cracker crumbs, baking soda and salt. Add to the butter/sugar mixture and mix just until well combined.
Use a cookie scoop to scoop out tablespoonfuls of dough onto a cookie sheet, about 2 inches apart. Bake for 8-10 minutes or until the edges begin to turn a light, golden brown. Remove from oven and cool on cookie sheets for a few minutes before transferring to a wire rack to cool completely.
Once cookies are cooled completely, mix the powdered sugar and marshmallow creme together until smooth and then divide into 12 equal portions. Roll each portion into a ball and place between 2 cookies, carefully pressing together to flatten out the filling.
Store at room temperature for up to several days in an airtight container.