Cook spaghetti by bringing  a large pot of salted water to a boil. Add the spaghetti noodles and stir to prevent the noodles from sticking.

Cook spaghetti noodles according to package directions.

Reserve about 1/4 cup of the spaghetti cooking water, then drain the spaghetti well.

Place the drained spaghetti back into the pot.

Add the butter, Parmesan cheese, garlic, & spaghetti water to the pot with the cooked and drained spaghetti.

Stir spaghetti mixture until everything is combined.

Add salt & pepper to taste