Preheat the oven to 350 F. In a large bowl, whisk together cake mix, eggs, and vegetable oil until smooth. Use a cookie scoop to place the cookies onto a large ungreased baking sheet at least 2-inches apart. Bake for 10-12 minutes.
Place one marshmallow onto half of the strawberry cookies. Place one heart shaped chocolate over each marshmallow. Bake for 2-3 minutes. Remove from the oven, and sandwich with the remaining strawberry cookies.