Preheat oven to 425°F (220°C).
Coat diced chicken in egg white, then toss with cornstarch and 3/4 teaspoon salt.
Arrange chicken on a greased sheet pan and bake for 10 minutes.
Flip chicken, add broccoli to the pan, drizzle with sesame oil, and season.
Bake another 10 minutes until chicken is cooked through.
In a bowl, whisk honey, sriracha, vinegar, and sesame oil.
Toss cooked chicken in the sauce until coated.
Divide rice, broccoli, and Honey Sriracha Chicken Meal Prep Bowls into containers.
Garnish with scallions and sesame seeds.