Place white chocolate candy coating, white chocolate baking bar, white chocolate chips in a slow cooker. Put the crock pot lid in place.
Heat candy for 1 to 1.5 hours on LOW until melted. Uncover and stir the chocolate mixture.
Stir in peanuts and broken pretzels until completely coated in the candy.
Drop by spoonfuls (I like to use a small cookie scoop) onto a baking sheet lined with parchment paper or a silicone mat. Top candy clusters with sprinkles and M&Ms while chocolate is still soft. Allow candy to set for at least one hour to set up.