Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Cut the chicken breast into one-inch cubes and dice the bell pepper and red onion into similar sizes.
Place the chicken, broccoli florets, bell pepper, and red onion onto the prepared baking sheet.
Drizzle with olive oil and sprinkle with sea salt, black pepper, and dried oregano, then toss thoroughly to coat.
Spread the mixture into a single layer and roast for 18 to 20 minutes until the chicken is cooked through and the vegetables are tender.
While the tray roasts, place the cauliflower rice in a non-stick skillet over medium heat and sauté for 5 to 7 minutes until softened.
In a small ramekin, whisk together the minced garlic and lemon juice to create a bright finishing sauce.
Divide the cauliflower rice into bowls, top with the roasted chicken and vegetable mixture, and finish with the lemon-garlic drizzle.