Creamy Italian Chicken

4-6 chicken breasts
1 package dry Italian seasoning
½ to 1 cube butter
8 oz. cream cheese
1 can cream of chicken soup
1 can mushrooms (optional)

Cube chicken and place in slow cooker. Cover with Italian seasoning packet and cubed butter. Cook on low for 4 hours or high for 2 hours. Add cream cheese and cream of chicken soup. Stir until hot and smooth. Serve over rice, bread, or both.