Grease 9x13 dish and place chicken breast in baking dish. Sprinkle with taco seasoning on both sides of breasts, and pour salsa on top of both breasts.
Bake for 30-35 minutes or until internal chicken temperature is 165 degrees.
Sprinkle chicken with cheese and bake for an additional 3-5 minutes. Top with sour cream and any other toppings desired.