In a microwave safe bowl heat together white chocolate and butter on 50% power, for 30 second intervals, stirring well after each interval until completely melted and smooth. Stir in lemon extract.
8 oz white chocolate almond bark, 2 Tablespoons unsalted butter, 1/2 teaspoon lemon extract
Pour white chocolate mixture over a bowl of Chex cereal and mix until well coated.
5 cups Chex cereal
Add powdered sugar and lemon zest to a zip top plastic bag. Pour in cereal mixture. Seal the bag and toss until everything is evenly coated.
1 1/2 cups powdered sugar, 1 lemon
Spread mixture onto a baking sheet and let it set up for 30 minutes before storing or serving.
Notes
If you don't have lemon extract, you can use 2 Tablespoons fresh lemon juice. Increase powdered sugar by 1/2 cup since there will be more liquid in the mixture.