Preheat your oven to 400°F.
Toss the chicken breast with mixed herbs, minced garlic, a drizzle of olive oil, and a squeeze of lemon juice. Season with salt and pepper as desired.
Place the chicken on a baking sheet and roast in the oven for 20-25 minutes until fully cooked and lightly browned.
While the chicken roasts, prepare the vegetables by slicing bell pepper, zucchini, and red onion. Toss them lightly with a pinch of salt, pepper, and a small drizzle of olive oil.
Sauté the vegetables in a skillet over medium heat for about 5-7 minutes until they are tender-crisp.
Warm the pre-cooked quinoa in a microwave or on the stovetop.
Assemble the bowl by layering the quinoa, roasted chicken (sliced if desired), and sautéed vegetables.
Finish with an extra drizzle of lemon juice if desired, and serve immediately.