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 over medium heat, melt the butter. Add the minced garlic and sauté for 1-2 minutes until fragrant but not browned.

Stir in the chopped parsley, salt, and pepper.

Add the drained pasta to the skillet with the garlic butter sauce. Toss to combine, adding reserved pasta water a little at a time until desired consistency is reached.

Remove from heat and stir in the grated Parmesan cheese until melted and well combined.

Serve immediately, garnished with additional parsley and Parmesan if desired.