Preparation of Chicken: Begin by cutting 1 lb of skinless boneless chicken breasts or thighs into bite-sized cubes. In a mixing bowl, combine ¼ cup cornstarch, ¼ cup all-purpose flour, 1 tsp ginger garlic paste, ½ tsp salt, and ¼ tsp ground black pepper. Coat the chicken pieces thoroughly with this flour mixture.
Frying the Chicken: In a deep frying pan or wok, heat neutral oil over medium-high heat. Once hot, carefully add the coated chicken pieces, ensuring not to overcrowd the pan. Fry until the chicken is golden brown and crispy—approximately 5-7 minutes. After frying, remove the chicken and place it on a paper towel-lined plate to drain excess oil.
Making the Sauce: In the same pan, add 3 tbsp of cooking oil. Once the oil is heated, sauté 2 tbsp of chopped garlic and 2-3 chopped green chilies for about 1-2 minutes until fragrant. Next, add 1 large cubed onion and 1 cup of cubed bell peppers. Stir-fry these vegetables until they become slightly soft but remain crisp, around 3-4 minutes.
Combining Ingredients: In a separate bowl, create a cornstarch slurry by mixing 2 tbsp of cornstarch with 1 cup of water. Add in the slurry to the sautéed vegetables along with 2 tbsp dark soy sauce, 4 tbsp sweet chili sauce, 2 tbsp red chili paste, 2 tbsp ketchup, 1 tbsp rice vinegar, ½ tsp salt, and ½ tsp ground black pepper. Stir this mixture until it thickens, which should take about 2-3 minutes.
Final Touches: Once the sauce has reached the desired consistency, gently fold in the fried chicken and 1 cup of cubed ripe mangoes. Allow the dish to heat through for a few more minutes, making sure everything is well coated.
Serving the Dish: Garnish your dish with chopped spring onions for a fresh finish. Serve warm over rice or noodles for a perfect meal!