For a square pan: create a sling by tearing two sheets of parchment or wax paper and lay them in the pan perpendicular to each other.

For a round pan: spray the insides of the sides of pan with baking spray. Wipe the bottom of the pan if necessary. Cut out a piece of parchment paper or wax paper the same size of the pan (lay the pan on top of the paper and mark with a pen then cut out).

In one microwave safe glass bowl, microwave the white chocolate chips on 50% power in 30 second increments until melted. Mix with a spoon after each microwaving increment. Pour first layer into pan and using a spoon or butter knife, spread evenly. Add pretzels and press down. Refrigerate for 5 to 10 minutes.

Melt second layer of white chocolate & candy melts in the same way as the first layer of chocolate. Remove pan from refrigerator and pour melted chocolate/candy on top of the pretzels. Using a spoon or butter knife, spread the chocolate evenly. Add sprinkles, cookie crumbs or whatever you'd like to on top. Refrigerate for at least 1 hour before cutting with a sharp knife.