01 - 
                Line a large sheet pan with parchment paper. Add Chex cereal to a large bowl and place powdered sugar in a gallon-size zip-top bag.
              
              
              
                02 - 
                Microwave white chocolate in 30-second intervals, stirring between, until melted. Alternatively, use double boiler method.
              
              
              
                03 - 
                Pour melted chocolate over cereal and stir to coat. Transfer half the mixture to powdered sugar bag and shake to coat completely.
              
              
              
                04 - 
                Fold pretzels into remaining chocolate-coated cereal. Spread on parchment paper, add sprinkles and M&Ms, then top with powdered sugar-coated Chex.
              
              
              
                05 - 
                Let rest for 20 minutes, then gently break up large chunks before serving.