Melt the butter in a medium skillet over medium-high heat.
Meanwhile, spread one side of one of the bread slices with mayo. Spread one side of the other slice of bread with the mustard.
Cut a 1" wide 'X' pattern in the middle of the bologna if using thing slices. This will keep it from curling. I didn't have to do this with my thick bologna.
Add bologna to skillet and swirl around to coat the bottom in the butter. Cook a few minutes until browned, then flip and repeat.
Add the cheese slices to the bologna and cook another minute to melt.
Place the bologna on top of the mayo-topped bread slice.
Add the chow chow, potato chips and shredded lettuce.
Add the last piece of bread and gently push down on the sandwich to just crush the chips. Don't destroy them, just make the sandwich bite-able.