Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Dice the zucchini and red bell pepper into uniform 1-inch pieces to ensure even roasting.
Season the chicken breast on both sides with sea salt, black pepper, and dried oregano.
Arrange the chicken, zucchini, and bell peppers on the baking sheet, drizzling with half of the olive oil.
Roast for 20-25 minutes until the chicken reaches an internal temperature of 165°F and the vegetables are tender.
While roasting, ensure your quinoa is cooked and fluffy; if using pre-cooked, warm it slightly in a pan.
In a small jar or bowl, whisk together the remaining olive oil and lemon juice to create a bright dressing.
Slice the roasted chicken into thin strips and assemble the bowls by layering quinoa, roasted vegetables, and chicken.
Garnish with halved cherry tomatoes and crumbled feta cheese before drizzling with the lemon-herb dressing.