Cook the rice according to package directions; set aside and keep warm.
Steam or boil the broccoli florets until they reach your desired tenderness, then drain and set aside.
Place the chopped scallions on a plate and prepare other ingredients.
Put the cut chicken pieces into a large resealable bag with the cornstarch and shake or toss until the chicken is evenly coated.
In a small bowl, whisk together the honey, minced garlic, grated ginger, soy sauce, sriracha, and water to make the sauce.
Heat the olive oil in a skillet over medium-high heat. Add the coated chicken and cook, stirring occasionally, until the pieces are no longer pink on the outside (a few minutes).
Pour the sauce into the skillet with the chicken, reduce heat to medium, and simmer until the chicken is cooked through and the sauce has thickened, about 3–6 minutes.
Divide the cooked rice, broccoli, and honey-ginger chicken evenly among four meal-prep containers.
Garnish each bowl with chopped scallions and sesame seeds if desired, then cool before storing or serving.