Cheat Sheet Roasted Vegetable Couscous

Name: Cheat Sheet Roasted Vegetable Couscous
Ingredients: 1 cup small broccoli florets (from about 1/2 head); 2 medium carrots, cut into 1/4-inch rounds (about 1 cup); 1 red bell pepper, cut into 1-inch chunks (about 1 cup); 1/2 yellow onion, cut into 3/4-inch large dice (about 1 cup); 3 tablespoons extra-virgin olive oil; Kosher salt and freshly ground black pepper; 1 1/4 cups chicken stock; One 15.5-ounce can chickpeas, drained and rinsed; 1 cup couscous; Pinch crushed red pepper flakes, for serving; Juice of 1/2 lemon; Fresh mint leaves, for garnish