Step 1

Mix chicken broth, soy sauce, cornstarch, sugar, vinegar, and cayenne pepper together in a bowl until sauce is smooth.

Step 2

Heat oil in a wok or large skillet over medium-high heat; saute chicken and garlic until chicken is no longer pink in the center, 5 to 10 minutes. Add red bell pepper and saute until slightly tender, about 1 minute.

Step 3

Stir sauce into chicken chicken mixture and cook until thickened, about 1 minute. Stir peanuts into chicken mixture and garnish with green onions.