Heat a large saucepan over medium heat and add half of the extra virgin olive oil. Add the crushed garlic and sauté, stirring, until fragrant and lightly golden (about 30–60 seconds).
Add the coarsely chopped grilled peppers and toss for 2 minutes.
Add the coarsely chopped leeks, diced carrots, diced zucchini, diced eggplant, and the ground black pepper. Cook, stirring occasionally, for about 8 minutes, until the vegetables are softened and slightly toasted.
Add the dry couscous and toss with the vegetables for 1 minute to coat the grains in oil and vegetables.
Pour in the vegetable broth, bring to a gentle simmer, cover the pan, reduce the heat to low–medium, and cook for 5 minutes or until the broth is completely absorbed by the couscous.
Turn off the heat. Drizzle the remaining extra virgin olive oil over the couscous and gently fluff the mixture with a fork to separate the grains.
Sprinkle the finely chopped parsley over the couscous and serve.