Creamy Zesty Italian Chicken

3-4 Chicken Breasts
3 Tablespoons Butter
1 Package Zesty Italian Dressing Mix
1 Can Cream of Mushroom Soup
1 Cube (8 oz) Cream Cheese

Put frozen chicken in crock pot. Melt butter and drizzle over chicken. Sprinkle the zesty Italian dressing mix over the top. Cook 3-4 hours on high or 5-7 on low (crock pots vary). A half hour before done add cream cheese and cream of mushroom soup (I usually cut the cream cheese in half and soften it in the microwave for 20-30 seconds and mix it with the cream of mushroom soup before I add it to the crock pot). Remove from heat and shred chicken with a fork and knife. Serve over rice.