01 - Preheat your oven to 375°F and lightly grease a 9x13-inch baking dish with cooking spray or a small amount of oil.
02 - Pat the chicken breasts dry with paper towels. Season both sides generously with kosher salt and freshly ground black pepper. Arrange the seasoned chicken in the prepared baking dish in a single layer.
03 - In a medium mixing bowl, combine the sour cream, mayonnaise, chopped green onions, dry onion soup mix, garlic powder, onion powder, and milk. Whisk thoroughly until all ingredients are fully incorporated and the mixture is smooth and creamy.
04 - Spread the sour cream and onion mixture evenly over each chicken breast, ensuring the meat is completely covered with the sauce.
05 - Sprinkle the shredded cheddar cheese over the sauced chicken. If desired, add the crushed crackers or potato chips on top for extra crunch.
06 - Place the baking dish in the preheated oven and bake uncovered for 25 to 30 minutes. The chicken is done when it reaches an internal temperature of 165°F and the sauce is bubbly around the edges.
07 - Remove the dish from the oven and let the chicken rest for 5 minutes to allow the juices to redistribute. Garnish with additional chopped green onions before serving.