Combine rinsed quinoa, chicken broth, and salt in a saucepan and bring to a boil.
Reduce heat, cover, and simmer for 15 minutes until quinoa is fluffy; fluff with a fork and set aside.
Preheat oven to 400°F (200°C).
Rub chicken breasts with olive oil, garlic powder, Italian seasoning, paprika, salt, and pepper.
Place chicken on a lined baking sheet and roast for 18 to 22 minutes until cooked through.
Rest chicken for 5 minutes, then slice.
Toss zucchini, red bell pepper, broccoli, and red onion with olive oil, salt, and pepper on another baking sheet.
Roast vegetables for 15 to 20 minutes, flipping once, until tender and caramelized.
Whisk together pesto, olive oil, and lemon juice until smooth and pourable.
Divide quinoa among bowls, top with roasted vegetables and sliced chicken.
Drizzle generously with pesto sauce and add optional toppings as desired.
Serve warm or chilled for meal prep.