Preheat oven to 400 degrees Fahrenheit (200 degrees Celsius) and line a large baking sheet with parchment paper.
In a large bowl, toss the cubed sweet potatoes with 1 tablespoon of olive oil and half of the salt and pepper.
Spread the sweet potatoes on the prepared baking sheet and roast for 15 minutes.
While potatoes roast, season the chicken cubes with garlic powder, smoked paprika, and the remaining salt and pepper.
Remove the baking sheet from the oven and add the chicken and broccoli florets, drizzling with the remaining 1 tablespoon of olive oil.
Return the sheet to the oven and roast for an additional 15 to 20 minutes until the chicken reaches an internal temperature of 165 degrees Fahrenheit and the potatoes are fork-tender.
Portion the cooked brown rice into four serving bowls.
Divide the roasted chicken, sweet potatoes, and broccoli evenly among the bowls.
Garnish with fresh parsley before serving.