Place the chicken breasts into a slow cooker, and top with 3/4 of the buffalo sauce and the ranch dressing mix. Cover and cook on low for 6 to 7 hours or on high for 3-4 hours..
Once the chicken has cooked, remove to a bowl and pour out any liquid left in the crock pot. Use two forks or the paddle attachment in the bowl of a stand mixer, to shred the chicken. Add the rest of the buffalo sauce and mix well.
In another bowl, combine the coleslaw with the dressing, just enough to coat. You don't want soggy slaw.
To assemble, place a heaping spoonful of the slaw on the bottom bun of each roll, top with a generous portion of the buffalo chicken, and drizzle a little ranch or blue cheese on top before placing the top bun on, and enjoy!