Boil the spaghetti in salted water.
Slice the garlic thinly.
Heat olive oil in a pan and sauté the garlic over low heat.
Add peperoncino and sauté together.
Add a bit of pasta water to emulsify.
Add the cooked spaghetti to the pan and mix well.
Season with salt and pepper.
Finish with parsley or Parmesan cheese.