Melt the butter in a large stock pot over medium-low heat.
Once the butter is melted, add the marshmallows and stir until fully melted and smooth.
Remove the pot from heat and mix in the Rice Krispies. Stir until every piece of cereal is coated with the marshmallow mixture.
Lightly coat a 9x13-inch baking dish with nonstick spray. Spread the cereal mixture evenly in the dish, pressing it down firmly to make it compact. Let it cool for at least 2 hours.
Once cooled, cut the mixture into 30 small squares.
Pour the melted chocolate into a piping bag and drizzle it over each square. Immediately sprinkle with your choice of silver and gold sprinkles.
Let the chocolate set and harden before serving.