Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Cut the chicken breast, zucchini, and red bell pepper into uniform 1-inch pieces to ensure even cooking.
Place the chicken and vegetables on the baking sheet, drizzle with olive oil, and sprinkle with sea salt, black pepper, and garlic powder.
Toss everything together until well-coated, then spread into a single layer on the sheet.
Roast for 18 to 20 minutes, or until the chicken is cooked through and the vegetables are tender and slightly charred.
In a large bowl, combine the warm roasted chicken and vegetables with the cooked brown rice.
Fold in the Greek yogurt for a creamy finish and garnish with fresh parsley before serving.