Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Dice the chicken breast, red bell pepper, and zucchini into uniform bite-sized pieces.
Place the chicken and vegetables on the baking sheet, drizzle with olive oil, and season with half of the sea salt and black pepper.
Roast in the oven for 18 to 20 minutes until the chicken is cooked through and the vegetables are tender.
While the chicken roasts, combine the quinoa and water in a small saucepan and bring to a boil.
Reduce the heat to low, cover, and simmer for 15 minutes until the water is absorbed and the quinoa is fluffy.
In a large mixing bowl, whisk together the lemon juice and the remaining sea salt and black pepper.
Add the cooked quinoa, roasted chicken, and vegetables to the bowl, toss with fresh parsley, and serve warm or chilled.