Preheat your oven to 400°F (200°C).
Dice the chicken breast, red bell pepper, and zucchini into uniform bite-sized pieces.
Place the chicken and vegetables on a parchment-lined baking sheet and toss with half of the olive oil, sea salt, and black pepper.
Roast in the oven for 18-20 minutes, or until the chicken is cooked through and the vegetables are slightly caramelized.
While the chicken roasts, rinse the quinoa under cold water and place it in a small saucepan with 0.5 cup of water. Bring to a boil, then reduce heat to low, cover, and simmer for 15 minutes.
In a large mixing bowl, whisk together the remaining olive oil, lemon juice, lemon zest, and chopped fresh parsley.
Once the quinoa is cooked, fluff it with a fork and add it to the mixing bowl along with the roasted chicken, vegetables, and crumbled feta cheese.
Toss everything together until well combined and serve warm or chilled.