I buy the following for a quick stir-fry:

- pre chopped chicken, usually in the poultry section
- box of pre-sliced mushrooms, and bag of pre-chopped broccoli, found in the produce section. Sometimes I'll also grab a handful of bean sprouts to toss in there.

Saute the chicken first until almost cooked through, add the veggies, and soy sauce with a dash of either sherry or dry wine. Add other seasons to taste. The longest time is cooking the chicken - about 5 to 6 minutes.