Step 1

Preheat oven to 300 degrees F (150 degrees C), and grease a 7x11 inch baking dish.

Step 2

Pound the chicken breasts with a meat mallet until flattened. Place 1 tablespoon of butter on each breast, and sprinkle with Italian dressing mix. Roll up the breasts, secure them with toothpicks, and place in the baking dish.

Step 3

Whisk together the cream of chicken soup, sour cream, and sherry in a bowl until smooth, and pour over the chicken rolls.

Step 4

Bake in the preheated oven until the chicken is cooked through and tender and the sauce is bubbling, about 1 1/2 hours.