Slow Cooker Buffalo Chicken Sandwiches

4 skinless, boneless chicken breast halves

1 (17.5 fluid ounce) bottle buffalo wing sauce, divided

½ (1 ounce) package dry ranch salad dressing mix

2 tablespoons butter

6 hoagie rolls, split lengthwise

Place the chicken breasts into a slow cooker, and pour in 3/4 of the wing sauce and the ranch dressing mix. Cover, and cook on Low for 6 to 7 hours.

Once the chicken has cooked, add the butter, and shred the meat finely with two forks. Pile the meat onto the hoagie rolls, and splash with the remaining buffalo wing sauce to serve.