In a medium pot, bring 4 cups of water to a boil. Add the brown rice and a pinch of salt. Reduce heat to low, cover, and simmer for about 30 minutes or until the rice is tender and water is absorbed.
Preheat your oven to 425°F (220°C).
On a baking sheet, toss the diced sweet potatoes with 1 tablespoon of olive oil, paprika, garlic powder, onion powder, salt, and black pepper. Spread them out evenly on the sheet.
Place the sweet potatoes in the oven and roast for 20-25 minutes, or until they are golden and tender, flipping halfway through.
While the sweet potatoes are roasting, heat the remaining tablespoon of olive oil in a skillet over medium heat. Season the chicken breasts with salt and pepper. Add the chicken to the skillet and cook for about 6-7 minutes on each side or until fully cooked.
Once the chicken is cooked, remove it from the skillet and let it rest for a few minutes before slicing it into bite-sized pieces.
If using, steam the broccoli florets in a pot or microwave until tender, about 3-5 minutes.
In each bowl, start with a base of brown rice, followed by roasted sweet potatoes, sliced chicken, and broccoli (if using).
Finish with a sprinkle of chopped parsley and a squeeze of fresh lemon juice if desired.