In a medium saucepan, melt 4 tablespoons of unsalted butter over low heat. Add 10 ounces of mini marshmallows and stir until melted and smooth, about 3-5 minutes.

Remove the saucepan from heat and add 6 cups of puffed rice cereal. Gently fold until all cereal is coated.

Allow the mixture to cool for 5 minutes, then grease hands and form into 1-inch balls. Place on a parchment-lined baking sheet.

Melt 12 ounces of white chocolate in a microwave-safe bowl, stirring until smooth. Dip each ball into the chocolate and allow excess to drip off.

Sprinkle holiday sprinkles onto the chocolate coating while it's still wet, then transfer onto parchment paper to cool.