Sweet and Sour Chicken with Peppers

Name: Sweet and Sour Chicken with Peppers
Total time: 20 min
Yield: 3
Ingredients: 0.5 onion; 1 red pepper; 3 chicken breasts; 2 tbsp mild ketchup; 2 tbsp soy sauce; 0.5 cup apple cider vinegar; 1 green pepper; 0.5 cup cornstarch; 1 tbsp cornstarch; 2 tbsp oil; 1 tsp dried garlic; 2 tbsp cold water; 0.75 cup sugar; 0.5 tsp onion salt; cooked rice as needed