Preheat your oven to (350 degrees F - 177 degrees C)
In a bowl, add oil, eggs and cake mix. Mix until everything is combined.
Add chocolate chips.
Use a cookie scope (I used 2 tablespoon measuring spoon) . Scope them into a prepared baking tray.
Add more chocolate chips on top and marshmallows if you want.
Bake on 350 degrees F for 15 minutes .
Let them cool down for 10 minutes and enjoy them.