In a small bowl combine the broth, cornstarch, ketchup, soy sauce, rice vinegar, sugar, salt the sesame oil. Stir until well blended.
Heat 1 tablespoon peanut oil in a wok or cast iron skillet over medium heat. Add the chicken, slowly stir until opaque about 1 minute. Transfer to a plate; clean the wok then add 2 tablespoon peanut oil, add the garlic and ginger. Stir fry for 30 seconds the add the vegetables, stir fry until tender. Add the chicken and the sauce mixture. Cook until sauce thickens about 2 to 3 minutes. Sprinkle sesame seeds and garnish with green onions.
Recipe by The Gluten Free at https://www.theglutenfree.com/gluten-free-sweet-and-sour-chicken/