Season the chicken breasts with Italian seasoning, salt, and pepper on both sides.
Heat olive oil and melted butter over medium-high heat, then add the seasoned chicken breasts and cook until golden brown on both sides, about 6-7 minutes per side.
Remove the chicken from the skillet and combine cream of chicken soup, milk, sour cream, onion powder, and Ranch seasoning mix over medium heat until well blended.
Return the chicken to the skillet, ensuring it’s coated with the creamy sauce; let it simmer for an additional 5-10 minutes on low heat.
Serve hot alongside your favorite vegetables and warm baked potatoes.