Cook pasta in salted boiling water until al dente.
Warm olive oil in a pan over medium heat.
Add thinly sliced garlic and cook until golden and fragrant.
Sprinkle chili flakes for a spicy kick.
Drain pasta, reserve water, and mix with garlic oil.
Add salt, pepper, and pasta water for desired consistency.
Top with parsley, Parmesan (optional), and serve hot.