Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Dice the zucchini and bell pepper into uniform pieces, then toss them on the baking sheet with the halved tomatoes, half of the olive oil, and a pinch of salt and pepper.
Roast the vegetables for 15 to 18 minutes until they are tender and slightly caramelized around the edges.
While the veggies roast, cook the orzo in a large pot of boiling salted water until al dente, then drain thoroughly.
Season the chicken breast with garlic powder, salt, and pepper, then sear in a hot skillet over medium heat until golden brown and the internal temperature reaches 165°F.
In a large mixing bowl, whisk together the remaining olive oil, lemon juice, lemon zest, and freshly chopped parsley to create a vibrant dressing.
Slice the cooked chicken into bite-sized strips and add them to the bowl along with the warm orzo and roasted vegetables, tossing everything together until perfectly coated.