01 - 
                Combine sugar, apple cider vinegar, ketchup, soy sauce, and garlic powder in a small bowl. Whisk thoroughly until fully integrated and set aside.
              
              
              
                02 - 
                Pour oil to a depth of 5cm in a high-sided skillet. Heat to medium temperature while preparing the chicken.
              
              
              
                03 - 
                Cut chicken breasts into 2.5cm bite-sized chunks. Place in a large sealable bag or bowl with salt, pepper, and cornstarch. Seal bag and shake vigorously (or stir thoroughly if using bowl) until all pieces are evenly coated.
              
              
              
                04 - 
                Heat oven to 165°C. Coat a 33x23cm baking dish with cooking spray.
              
              
              
                05 - 
                Crack eggs into a shallow dish or bowl and whisk until smooth.
              
              
              
                06 - 
                Working in batches, dip cornstarch-coated chicken pieces into beaten egg, shake off excess, and carefully place in hot oil. Cook approximately 3 minutes per side until exterior is golden brown. Chicken will finish cooking in the oven.
              
              
              
                07 - 
                Remove fried pieces with a slotted spoon and place on paper towel-lined plate to drain excess oil. Transfer drained pieces to prepared baking dish.
              
              
              
                08 - 
                Pour prepared sweet and sour sauce over chicken in baking dish. Gently fold to ensure all pieces are coated evenly.
              
              
              
                09 - 
                Bake for 60 minutes at 165°C, stirring every 15 minutes to maintain even sauce distribution and caramelization.
              
              
              
                10 - 
                Serve hot over steamed rice and garnish with sliced green onions if desired.