Mix flour, salt and pepper in a large shallow dish. Coat chicken in flour mixture and brown in oil in a skillet over medium high heat (you don’t need to cook all the way). Place chicken in 9x13" pan.
To make sauce, combine sugar, cornstarch, and bouillon in saucepan. Slowly stir in remaining ingredients. Bring to a boil. Boil for 1-2 minutes, stirring constantly.
Pour sauce over chicken. Add as much of the pineapple as you like. (I usually use about 2/3 of the can and let my kids eat the rest of the pineapple.)
Bake uncovered at 350° for about 25 minutes. Add green peppers and cook for about 5 minutes longer or till peppers are hot and chicken juices run clear. Serve with rice.