Spaghetti Aglio e Olio (Pasta With Garlic and Oil) Recipe

Ingredients

• 1 teaspoon kosher salt, plus more for the pasta water
• 1 pound dried spaghetti
• 1/3 cup extra-virgin olive oil
• 4 large cloves garlic, peeled and very thinly sliced
• 1/2 teaspoon crushed red pepper flakes
• 1/2 cup finely grated Parmesan cheese, plus more to pass at the table
• 2 tablespoons finely chopped Italian parsley (optional)