In a large pan, add marshmallows and butter. Heat on medium low until butter melts.
Remove from heat and stir until marshmallows melt and mixture is smooth.
Add in the cereal.
Fold in Β½ cup of the mini chocolate chips.
Press mixture into baking dish. Sprinkle the remaining mini chocolate chips and cover the pan with cling wrap and press down. Allow to chill for 2-3 hours before cutting.