Preheat your oven to 425°F (220°C).
In a large bowl, combine zucchini, yellow squash, red and yellow bell peppers, eggplant, and red onion.
Drizzle the vegetables with olive oil, and sprinkle with sea salt, black pepper, and Herbes de Provence. Toss to ensure all the vegetables are evenly coated.
Spread the vegetables out in a single layer on a large baking sheet. Avoid crowding to ensure they roast properly.
Roast in the preheated oven for about 30 minutes, or until the vegetables are tender and have a nice caramelized color. Halfway through, stir the vegetables and sprinkle fresh thyme leaves over them for added flavor.
While the vegetables are roasting, add quinoa and vegetable broth to a medium saucepan. Bring to a boil over medium-high heat.
Once boiling, reduce the heat to low and cover the pot. Simmer for about 15 minutes, or until the quinoa has absorbed all the broth and is tender.
Remove from heat and let it stand for 5 minutes, then fluff the quinoa with a fork.
Stir in olive oil, chopped parsley, lemon juice, lemon zest, and sea salt until well combined.
Divide the herbed quinoa among plates and top with a generous helping of roasted Provencal vegetables.