Roast the zucchini and Brussels sprouts at 425°F for 24 minutes.
Sauté the onion and minced garlic until soft. Add the ground chicken and sauté until cooked through.
Add the frozen spinach, seasoned salt, and oregano. Stir.
Remove the chicken and heat the brown rice and cauliflower rice with more seasoning and oregano.
Add the rice mixture, chicken mixture, and veggies to each of 4 bowls.
Top with salsa, diced cherry tomatoes, Persian cucumber, Kalamata olives (combined for all 4 servings), and a dollop of tzatziki.