Slice the garlic thinly.
Prepare the peperoncino.
Boil the spaghetti noodles in salted water.
Heat olive oil in a pan, then sauté the garlic and peperoncino.
Reserve some pasta water, drain the noodles, and add them to the pan.
Pour a little pasta water into the pan while tossing.
Season with salt and pepper, then finish with parsley.