01 -
Grease a 9x13-inch baking dish and set aside.
02 -
In a large saucepan over low heat, melt butter most of the way. Add 16 ounces marshmallows, and stir until completely melted. Remove from heat.
03 -
Stir in 8 cups cereal until combined. Add remaining 5 ounces marshmallows and 1/2 cup mini semisweet chocolate chips, and stir to combine.
04 -
Press cereal mixture into prepared baking dish. Sprinkle with remaining 1/4 cup cereal and 1/4 cup mini chocolate chips.
05 -
Let cool to room temperature before cutting and serving.