Add the chocolate chips, peanut butter, maple syrup, and coconut oil to a microwave-safe bowl. Microwave on high in 30-second intervals until melted, then use a whisk to fully combine into a thick, chocolate mixture.

Add the Chex cereal to a large bowl, pour the chocolate mixture over the cereal and toss it all together, making sure to coat all of the cereal in the chocolate coating. Use a rubber spatula for easier mixing.

Add the protein powder to the bowl with the chocolate-covered Chex and toss to coat it all evenly. Alternatively, place it into a ziplock bag, add the protein powder, and shake it up.

You can dig in right away or spread the puppy chow onto a lined baking sheet and let it sit or chill for a few minutes to set up more and get even crunchier.