Divide the rice chex cereal evenly between two medium-sized bowls, with 2.5 cups in each bowl.

Melt the white melting chocolate according to package directions, typically microwaving for about 30 seconds intervals, stirring well between each, until melted and smooth. Add the melted white chocolate to one bowl of the chex cereal and gently stir to coat evenly. Be careful not to break the chex cereal too much.

Add the powdered sugar to the white chocolate coated chex cereal and gently stir to coat evenly with powdered sugar. You can also place the chex cereal and powdered sugar in a ziplock bag and shake to coat.

Repeat the same process with the red melting chocolate and strawberry cake mix, coating the other half of chex cereal.

Allow to dry completely, then combine the two kinds of puppy chow together and add the M&Ms.