Line a 9-inch x 9-inch brownie pan with parchment paper.
Add the butter, cocoa powder and marshmallows to a microwave safe bowl and heat until the marshmallows start to melt.
Stir once, and then return to the microwave until the marshmallows are completely melted.
Stir until the mixture is uniform in appearance.
Add the cornflakes and chocolate chips and stir to coat evenly.
Empty the mixture into your prepared pan and use another sheet of parchment paper to flatten the top and press the mixture into the corners of the pan.
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