Sweet and Sour Chicken Stir-Fry is a healthy and delicious Chinese dish that combines the perfect balance of sweet and tangy flavors. This recipe features tender chicken breast pieces stir-fried with colorful bell peppers, onions, and pineapple chunks in a homemade sweet and sour sauce. The chicken is lightly coated in cornstarch and then quickly cooked until golden brown and crispy. The sauce is made with a combination of vinegar, ketchup, soy sauce, and sugar, creating a delightful blend of flavors. Serve this dish over steamed rice or noodles for a complete meal that the whole family will love.