Preheat oven to 350℉.
Place the chicken breasts in a 9 x 13-inch baking dish. Sprinkle with salt, pepper, and garlic powder.
4 bone-in, skin-off chicken breasts, Salt, Pepper, and Garlic Powder
In a medium bowl, whisk together the cream of mushroom soup and milk until combined. Add a little more milk if it's too thick. You want to be able to pour it, but not too thin. Pour over the chicken breasts in the baking dish.
1 10.5 ounce cream of mushroom soup, ¼ cup milk
Sprinkle the French Fried Onion Rings, evenly over the chicken. Bake for 1 hour to 1 hour 20 minutes, depending on the size of the chicken breasts.
1 cup French Fried Onion Rings
To serve, place a chicken breast on a plate and spoon the gravy over the top. Repeat with the remaining chicken.