1-First Step: Prepare the Chicken Dice your boneless skinless chicken thighs or breasts into even 1.5-inch cubes for uniform cooking. Season the cubes with salt and garlic powder to add flavor without the risk of burning. Coat the pieces evenly with cornstarch or potato starch, making sure not to pat them dry first as this helps the coating stick better in Chinese sweet sour chicken.

2-Second Step: Fry the Chicken Heat neutral oil like avocado or vegetable oil to 325-350°F in a heavy-bottomed pan for shallow frying. Fry the chicken in batches to avoid overcrowding, cooking each piece for 3-4 minutes per side until it’s golden and crispy. Once done, drain the chicken on a wire rack or paper towels to remove excess oil, ensuring your Chinese sweet sour chicken stays crunchy.

3-Third Step: Sauté the Vegetables and Pineapple In the same pan with reduced oil, sauté the onions, bell peppers of any color, and strained pineapple until they soften and release their flavors. This step adds freshness and color to your Chinese sweet sour chicken, taking about 2-3 minutes on medium heat. Stir occasionally to prevent burning and keep the veggies crisp-tender.

4-Fourth Step: Make and Add the Sauce Mix the sauce ingredients including ketchup, brown sugar, soy sauce, white vinegar, cold water, and cornstarch in a bowl. Pour this into the pan with the sautéed veggies and simmer until it thickens, which takes 1-2 minutes. This creates the sweet and tangy sticky sauce that defines Chinese sweet sour chicken, coating everything evenly.

5-Fifth Step: Combine and Serve Toss the fried chicken into the thickened sauce with the veggies and pineapple, stirring gently to coat. Let it heat through for another minute. Garnish with sesame seeds and green onions if you like, then serve your Chinese sweet sour chicken right away with rice or noodles for a complete meal in just 27 minutes total.