Mix the sauce ingredients together, mixing the water and corn starch together separately, and set aside.
Heat a large skillet over medium-high heat with 1/2 tablespoon of olive oil. Add the ground chicken and brown both sides for 1-2 minutes before breaking apart and fully cooking. Transfer the cooked chicken to a bowl.
Add the remaining tablespoon of olive oil, followed by the bell pepper and green beans. Season with a pinch of salt and pepper. Sauté for 5-7 minutes until the veggies pick up a bit of color and the green beans are tender.
Add the cooked chicken back to the skillet and toss everything together before adding the sauce around the edges of the pan. Stir everything together and cook until the sauce coats the stir fry, about 1-2 minutes. Be careful not to burn.
Serve over rice and garnish with scallions, toasted sesame seeds, and additional soy sauce or chili crisp, if desired.