This recipe is so easy, and pretty good.
It's from my ol' college cookbook and I pull this out when we don't or haven't had time to run to the grocery store. I serve with fried rice.
Also, if you haven't found a good GF soy sauce, I really like the San-J brand. It's a little more pricy but certified GF and less salty than other brands, which is a good thing!
Sweet and Sour Chicken
Chicken Breasts (however many you want) cut into small cubes
1 egg, beaten
Coat chicken pieces with egg. Then in cornstarch, but not too heavy. Lightly fry in 2 T. of oil. Just brown on both sides. Put in casserole dish and salt and pepper.
3/4 cup sugar
1/2 cup chicken broth
1 T. soy sauce
1/2 cup vinegar
1/4 c. ketchup
Pour over chicken and bake, uncovered for one hour at 325.