Preheat your oven to 400°F and line a baking sheet with parchment paper.
Dice the chicken breast, zucchini, and red bell pepper into uniform bite-sized pieces.
Place the chicken and vegetables on the baking sheet, drizzle with olive oil, and season with sea salt, black pepper, and dried oregano.
Roast in the oven for 15 to 18 minutes until the chicken is cooked through and the vegetables are slightly caramelized.
While the chicken roasts, cook the orzo in a pot of boiling water according to package instructions until al dente, then drain.
In a small mixing bowl, whisk together the non-fat Greek yogurt, lemon juice, lemon zest, minced garlic, and chopped fresh parsley to create the sauce.
Transfer the cooked orzo and the roasted chicken and vegetables into a large bowl.
Pour the creamy lemon-herb sauce over the mixture and toss gently until everything is thoroughly and evenly coated.
Serve immediately while warm, garnished with extra parsley if desired.