01 - 
                Line your 9-inch square pan with parchment paper. This makes it super easy to lift out later.
              
              
              
                02 - 
                Dump your white chocolate chips, dry cake mix, and marshmallow fluff in a big bowl. Just leave them there for now.
              
              
              
                03 - 
                Grab a pot and melt your butter, sugar, cream, and salt over medium heat. Keep stirring until it starts bubbling.
              
              
              
                04 - 
                Once it's really bubbling, set your timer for 4 minutes. Keep stirring the whole time - no breaks!.
              
              
              
                05 - 
                Pour the hot mixture over your bowl of chocolate and cake mix. Mix on low for a minute until the chocolate melts. Fold in most of your sprinkles.
              
              
              
                06 - 
                Pour it in your pan and quickly sprinkle the rest of the rainbow sprinkles on top.
              
              
              
                07 - 
                Now the hard part - leave it alone for 4 hours to set up properly.