Combine coconut milk and sauce mix in a small saucepan. Bring to a boil; cook and stir for 2-3 minutes or until thickened.
Arrange chicken in a greased 11-in. x 7-in. baking dish. Pour sauce over top. Bake, uncovered, at 350° for 20-25 minutes or until a thermometer reads 170°. Prepare rice according to package directions. Serve with chicken and sprinkle with onions and peanuts if desired. Yield: 4 servings.