01 - Place rice cereal squares in a large mixing bowl.
02 - In microwave-safe bowl, combine white chocolate chips, peanut butter, and butter. Microwave in 30-second intervals, stirring between each, until smooth and fully melted (about 1-2 minutes). Stir in vanilla extract.
03 - Pour chocolate mixture over cereal and gently fold with spatula until evenly coated.
04 - Transfer coated cereal to gallon-size zip-top bag. Add powdered sugar, seal bag, and shake until thoroughly coated.
05 - Spread mixture on parchment-lined baking sheet to cool for 10 minutes.
06 - Once cooled, stir in green candy-coated chocolates, mini marshmallows, gold chocolate coins, and green sprinkles. Gently toss to combine.
07 - Store in airtight container until ready to serve.