First, add the Chex cereal, pretzel sticks, M&M's, and walnuts to a large bowl.
Second, place the white chocolate chips in a microwave-safe bowl and warm them in 30-second intervals until completely melted.
Third, pour the melted chocolate over the cereal mixture in the mixing bowl.
Next, using a spatula, stir the dry ingredients and the white chocolate until everything is sticky and coated.
Then, pour the powdered sugar into the bowl.
Using clean hands, toss the white chocolate snack mix with the powdered sugar until everything is coated.
Next, pour sprinkles into the mixture and toss again.
Finally, store the snack mix in a Ziploc bag and enjoy immediately!