Preheat your oven to 400°F (200°C). In a small bowl, mix together garlic powder, onion powder, kosher salt, chili powder, ground cumin, cayenne pepper, and ground cinnamon. Toss diced sweet potatoes with half of the avocado oil and half of the seasoning blend. Spread on a baking sheet and roast for about 10 minutes.
Toss chicken breast pieces with remaining avocado oil and seasoning blend. After 10 minutes, toss sweet potatoes and add seasoned chicken to the baking sheet. Bake for another 15 minutes until sweet potatoes are tender and chicken reaches an internal temperature of 165°F (75°C).
Place kale leaves in a bowl, drizzle with olive oil, squeeze in lemon juice, and sprinkle with salt. Massage the kale for about one minute until tender and vibrant. Set aside.
In a separate bowl, combine Greek yogurt, mayonnaise, chipotle sauce, lemon juice, agave syrup, and a pinch of salt. Mix until well blended and creamy.
Divide cooked brown rice between bowls. Layer with massaged kale, roasted sweet potatoes, and chicken. Top with avocado, feta cheese, green onions, and drizzle with chipotle sauce.