Bring a large pot of salted water to a boil. Add the spaghetti and cook according to package instructions until al dente.

Reserve 1 cup of pasta water, then drain the pasta in a colander.

In a skillet, melt 1/4 cup of butter over medium heat. Add the minced garlic and sauté for 1-2 minutes until fragrant.

Add the cooked pasta to the skillet along with the remaining butter, parsley, salt, and pepper. Toss to combine, adding reserved pasta water as needed to reach desired consistency.

Serve immediately, topped with grated parmesan cheese if desired.