pasta primavera recipe

**Ingredients:** - 12 ounces pasta (such as penne, farfalle, or fettuccine) - 2 tablespoons olive oil - 1 small red onion, thinly sliced - 2 cloves garlic, minced - 1 red bell pepper, thinly sliced - 1 yellow bell pepper, thinly sliced - 1 zucchini, sliced into half-moons - 1 cup cherry tomatoes, halved - 1 cup broccoli florets - 1 cup peas (fresh or frozen) - 1/4 cup grated Parmesan cheese - 1/4 cup fresh basil, chopped - Salt and pepper to taste - Optional: red pepper flakes for a bit of heat - Optional: lemon zest for extra brightness