I make something similar....but I add 1 can of drained pineapple chunks to the chicken and onions and reserve the liquid. This way..everything gets soaked. then...follow oven directions. After chicken has been in the oven for 20 minutes, I add 1 diced green pepper in large slices, and then I quarter about 5 PLUM shaped tomatoes and add to the top...just so they are coated with a little sauce, then I continue baking. This way..the pepper and tomatoes are not too mushy...still firm. When chicken is done, I remove everything and leave the sauce in the pan or another pan that can go onto the stovetop...then I add a scant teaspoon of white or apple cider vinegar and a dash of worcestershire. I thicken with a 2 tsp. of corn starch diluted in the remaining pineapple juice...then added back into the pan. Sometimes a little garlic powder is needed here. Heat til thick and smooth stirring regularly...pour over chicken and veggies. Serve over Rice. Have some soy sauce on the table.