Preheat your oven to 400°F and line a baking sheet with parchment paper.
Place the chopped zucchini and red bell peppers on the sheet, mist with a bit of water or broth, and roast for 15-18 minutes until tender.
While veggies roast, heat avocado oil in a large deep skillet over medium-high heat.
Add the diced chicken breast to the skillet and cook until golden and no longer pink, then remove from the pan and set aside.
In the same skillet, sauté the onion and garlic for 3 minutes until translucent and aromatic.
Add the dry brown rice to the skillet, stirring constantly for 2 minutes to lightly toast the grains.
Stir in the tomato puree, chicken bone broth, cumin, sea salt, and black pepper.
Bring the mixture to a boil, then cover with a tight-fitting lid and reduce heat to low.
Simmer for 35-40 minutes, or until the rice is tender and the liquid has been fully absorbed.
Fluff the rice with a fork, then fold in the roasted vegetables and the cooked chicken.
Garnish with fresh cilantro and serve warm.