In alarge, microwave safe bowl melt the chocolate, peanut butter, honey and coconut oil. To do this I use 50% power and microwave in 20 second intervals, stirring between each interval, until everything is smooth and melted.
Stir the vanilla extract into the melted chocolate mixture, followed by the Chex cereal. Stir the cereal until each piece is well coated in chocolate.
Place the protein powder into a large, zip-loc bag and then scoop the cereal into the bag. Seal the bag and shake around until the protein powder evenly coats the cereal.