Trim chicken breast of fat, and cut into 1-inch cubes.
Add chicken breasts, butter, and Italian salad dressing mix to pan of slow cooker. Set slow cooker on low for five hours. After butter has melted, stir to combine. Place top on slow cooker.
Combine cream of mushroom soup and white wine. Add to chicken. Add cream cheese. Set slow cooker on high for 30 minutes. Place top on slow cooker.
Stir to combine; correct seasonings. Serve over egg noodles cooked according to package directions. Yield: 4 servings.