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