One-Pan Pasta

INGREDIENTS

• 12 ounces linguine
• 12 ounces cherry or grape tomatoes, halved or quartered if large
• 1 onion, thinly sliced (about 2 cups)
• 4 cloves garlic, thinly sliced
• 1/2 teaspoon red-pepper flakes
• 2 sprigs basil, plus torn leaves for garnish
• 2 tablespoons extra-virgin olive oil, plus more for serving
• Coarse salt and freshly ground pepper
• 4 1/2 cups water
• Freshly grated Parmesan cheese, for serving