Combine the white chocolate chips, butter, zest and lemon juice into a medium bowl. Bring a small pot of water to a simmer and place the bowl over top making sure the bottom of the bowl doesn't touch the water. Stir while the steam gently melts the chocolate and butter until just about smooth. Remove off of the heat and set aside.

Spread the cereal evenly in a large sheet pan. Drizzle the white chocolate/ lemon mixture and toss to coat.

Place the coated cereal in a large bowl and add in the powdered sugar. Gently stir to coat the cereal in the powdered sugar. Spread back out on a large piece of parchment paper and let cool/dry.

Eat immediately.