Preheat the oven to 350°F. Place four oven-safe meal prep containers on a baking sheet.
In a bowl, combine the chicken with Greek yogurt and the shawarma spice blend until evenly coated.
Divide the seasoned chicken evenly among the containers.
Add 2 tablespoons of dry jasmine rice to each container, then pour about ¼ cup chicken broth into each one.
Evenly distribute the onion, bell peppers, and broccoli around the chicken and rice.
Lightly season vegetables with salt and pepper if desired.
Cover each container tightly with foil.
Bake for about 50 minutes, until the chicken is fully cooked, the rice is tender, and the vegetables are soft.
Remove from the oven and let cool slightly.
Add fresh toppings just before serving or after reheating.