Cook spaghetti in well-salted water until al dente. Reserve pasta water before draining.

Heat olive oil over low heat and gently sauté garlic until fragrant and lightly golden.

Add red pepper flakes and stir briefly to release flavor.

Add drained spaghetti to the pan and toss with a splash of pasta water to emulsify.

Stir in parsley, adjust seasoning, and drizzle with olive oil before serving.