Whisk together chicken marinade ingredients then marinate chicken for 15 minutes. Grill or saute cook in a non-stick sprayed skillet until cooked through, then let the chicken rest for 5 minutes before cutting into slices. Set aside.
For the dressing:
Bring vinegar to a boil in a small saucepan. Turn off the heat then add the sugar and stir until dissolved. Let cool. Combine with the rest of the dressing ingredients in a jar or bowl then shake or whisk to combine.
For the salad:
Divide lettuce and spinach between four plates. Top with sliced chicken, salad dressing, and toppings.