In a large bowl, whisk together the powdered sugar and the cake mix. Set aside until needed.
Divide the Chex cereal into 3 different large bowls.
Divide the white candy melts into 3 different bowls, microwave until melted. Careful not to scorch! Add in a drop or two of fun Spring themed food coloring of your choice into each bowl to make various colors.
Pour one bowl of the candy melts over one bowl of the Chex Cereal. Stir very gently until the cereal pieces are coated. Careful not to break cereal into pieces. Add in sprinkles if desired. Pour ⅓ of the powdered sugar and cake mixture over the cereal pieces and stir gently until coated. Repeat with the second and third bowls of cereal.
Finally, mix all three of the cereal colors together in a large bowl. Enjoy within a week of making. Store in a ziploc bag or air tight container.