In a large bowl add cake mix, eggs, and melted butter
Mix well – the batter will be thick and sticky
Use a tablespoon (or a tablespoon sized cookie scoop) to scoop the dough
Arrange the cookie balls about 2 inches apart on your baking sheets, then flatten slightly with your fingers or back of spoon
Bake cookies about 10 - 12 minutes
While the cookies bake, cut the large marshmallows in half
When the cookies are done, press one marshmallow half (cut side down) into the center of each cookie
Return the cookies to the oven and bake another 1-2 minutes
Allow the pan of cookies to cool a few minutes, then transfer cookies to cooling rack