In a large bowl mix the cereal, mini marshmallows, and macadamia nuts together.
Pour the white chocolate chips into a separate microwave safe bowl and melt it by cooking it on high 30 seconds at a time, stirring in between until it is smooth. Once the white chocolate is melted add the peanut butter and stir it in, microwaving a little more if needed.
Pour the melted white chocolate peanut butter mixture over the cereal mixture and gently stir it together until it is completely coated.