Preheat your oven to 350°F (175°C) to ensure even baking.
Line your baking sheet with parchment paper or grease it lightly to prevent sticking.
In a large mixing bowl, combine the melted or softened butter, the box of cake mix, and the eggs. Mix until fully combined and forms a thick dough.
Fold in your choice of mix-ins, ensuring they are evenly distributed throughout the dough.
Using a cookie scoop or a spoon, portion out the dough onto your prepared baking sheet, leaving space between each scoop.
Bake for 10-12 minutes, or until the edges are lightly golden. The centers may look underbaked but will cook as they cool.
Allow the cookies to cool on the baking sheet for a few minutes before transferring them to a wire rack to cool completely.
