Preheat your oven to 400°F (200°C). In a bowl, coat chicken breasts with olive oil, garlic powder, paprika, salt, and pepper. Place on a baking sheet and roast for 20-25 minutes until cooked through.
Peel and dice sweet potatoes, toss with olive oil, cinnamon, and salt. Add to the baking sheet with chicken for the last 25-30 minutes of roasting.
Rinse brown rice under cold water. In a saucepan, combine rice, water or broth, and bay leaf. Bring to a boil, then reduce heat and simmer for 40-45 minutes for brown rice or 15-20 minutes for white rice.
Assemble the bowl by placing rice at the bottom, followed by roasted sweet potatoes and sliced chicken. Garnish with parsley or cilantro, and add avocado or cheese if desired.