Heat the vegetable oil in a large skillet or wok over medium-high heat.
Add the sliced chicken to the skillet and cook for about 5-7 minutes, or until the chicken is cooked through and no longer pink. Remove the chicken from the skillet and set aside.
In the same skillet, add the green beans and stir-fry for about 3-4 minutes until they are bright green and tender-crisp.
Add the minced garlic and ginger to the skillet and stir-fry for an additional 1 minute until fragrant.
Return the cooked chicken to the skillet. In a small bowl, mix the soy sauce, honey, sesame oil, and red pepper flakes (if using). Pour this sauce over the chicken and green beans, stirring to coat everything evenly.
Cook for another 2-3 minutes until the sauce is heated through and slightly thickened.
Serve the stir-fry over cooked rice or quinoa and garnish with sliced green onions.