Preheat oven to 400°F (200°C).
In a large bowl, toss cubed sweet potatoes with 1 tablespoon olive oil, 0.25 tsp salt, and 0.25 tsp pepper.
Arrange sweet potatoes on a parchment-lined baking sheet and roast for 15 minutes.
While potatoes roast, toss cubed chicken and broccoli with the remaining olive oil, garlic powder, smoked paprika, remaining salt, and remaining pepper.
Add chicken and broccoli to the baking sheet, spreading them in a single layer.
Return to oven and roast for 15 to 20 minutes, or until chicken reaches an internal temperature of 165°F (74°C).
Portion 0.5 cups of cooked brown rice into each of the four meal prep containers.
Distribute the roasted chicken, sweet potatoes, and broccoli evenly over the rice.