Coat bottom and sides of 13x9 pan very well with butter

Over med-low heat melt butter

When butter is almost completely melted - add cocoa powder and marshmallows and splash of vanilla. Stir continuously until almost completely melted

Add in chocolate chips and stir until melted.

Once melted, add cereal a few cups at a time.

Stir to combine completely and then press into the buttered pan.

Let cool 1-2 hrs and then cut. Enjoy!