01 - Set the oven to 375°F (190°C) to heat.
02 - Place the couscous in a heatproof bowl. Bring vegetable broth to a boil, pour over couscous, cover, and let it sit for 5 minutes. Fluff with a fork.
03 - Heat 1 tablespoon of olive oil in a large skillet over medium heat. Add chopped onion and diced zucchini, sauté for 4 to 5 minutes until softened. Add minced garlic and cook for 1 minute.
04 - Stir in quartered cherry tomatoes and cook for 2 to 3 minutes until just softened. Remove skillet from heat.
05 - In a large bowl, mix sautéed vegetables, couscous, chopped parsley, mint (if using), dried oregano, and half of the crumbled feta. Season with salt and pepper to taste.
06 - Drizzle the inside of each bell pepper with olive oil and sprinkle with salt. Fill each pepper with the couscous mixture, mounding slightly at the top.
07 - Arrange the stuffed peppers upright in a baking dish. Drizzle with remaining olive oil, cover the dish with aluminum foil, and bake for 30 minutes.
08 - Remove the foil, sprinkle remaining feta cheese and pine nuts (if using) on top. Bake uncovered for an additional 10 minutes until peppers are tender and tops are golden.
09 - Allow the peppers to cool for a few minutes before serving. Garnish with extra fresh herbs if desired.