This stir fry is really flexible and you can totally make it your own with what you have.
TIPS: Freeze your meat for 20 minutes for easier slicing, or use frozen meat and thaw slightly. Add whatever meat and vegetables you want. If you like a thicker sauce, add a little extra cornstarch to the sauce before pouring it in the pan. If you have a lot of meat and veggies, double the recipe for the sauce and use what you need.