Coat a 3 quart (9” x 13”) baking dish with butter and set aside.
Melt 1/4 cup of butter in a large pot over low heat.
When the butter is melted, add half of the 10 oz. bag of marshmallows add hot chocolate powder to the pot. Stir until fully mixed and melted.
Remove pot from heat, add six (6) cups of Rice Krispies and stir until fully mixed.
Pour onto buttered baking dish (from Step 1). Use a spoon and/or parchment paper to lightly press mixture to spread evenly in dish. Add extra unmelted marshmallows on top, if desired.
Let cool for 15-30 minutes before cutting into rectangles.