Prepare Chicken: Season the chicken breasts with salt and pepper. Heat olive oil in a skillet over medium heat. Sear the chicken for about 3-4 minutes on each side until golden brown (it doesn’t need to be cooked through).
Make the Sauce: In a bowl, combine the ranch dressing mix, cream of chicken soup, and sour cream. Mix until smooth.
Assemble: Place the seared chicken breasts in a greased baking dish. Pour the ranch mixture over the chicken, ensuring it’s well coated. Top with shredded cheddar cheese.
Bake: Cover the dish with aluminum foil and bake for about 25-30 minutes. Remove the foil and bake for an additional 10-15 minutes, or until the chicken is cooked through and the cheese is bubbly.
Serve: Let it rest for a few minutes before serving. Garnish with chopped green onions or parsley if desired.