Slice the chicken into thinner slices (1⁄2 inch). Pound with a meat tenderizer, the chicken will plump up more when cooked.
Sprinkle each side of the chicken with salt and pepper and the ranch seasoning mix. Brush one side of each piece with melted butter, make sure the butter isn't too hot.
Remove any excess oil from the skillet if needed. Add cream of chicken soup, milk, sour cream, 1⁄2 tsp onion powder, and ranch seasoning mix. Stir until combined. Let it bubble gently and reduce for 5 minutes.
Add the chicken and heat through for about 10 minutes.