Pour wing sauce and dressing mix into a large bowl and whisk to combine. Pour into a slow cooker set on low.
Add the chicken breasts and cook for about 6 hours until fall-apart tender. If the chicken breasts are too large to be submerged in the sauce, flip them over halfway thru the cooking time.
Remove breasts to a cutting board and shred or chop as desired. Return to the slow cooker and cook another 30 minutes.
Brown buns if desired.
Top buns with meat and cheese and place under broiler for just enough time to lightly melt the cheese.
Drizzle with a little salad dressing and serve. I also added a teaspoon or so of the sauce from the slow cooker.