Start by boiling a big pot of water. Once it bubbles away nicely, toss in your fettuccine and cook until it is al dente. You will know it is done when it is tender but still has a bit of a bite. Do not forget to save a cup of that pasta water before draining!
In a large pan, melt the butter over medium heat. You will appreciate the rich aroma as it starts to foam. Once melted, add the minced garlic, being careful not to let it burn, as that can turn your sauce bitter.
Pour in the heavy cream and let it simmer gently. Stir frequently until the mixture thickens slightly, then whisk in the shredded parmesan cheese. Keep an eye on it; if you stop whisking, the sauce might separate.
Sprinkle in the salt and pepper, giving everything a good stir. You will want the flavors to meld beautifully. Just a heads-up, always taste first! It is easy to over-season.
Gently toss the cooked fettuccine into the sauce, letting it soak up all that creamy goodness. If it feels too thick, add a splash of the reserved pasta water until you hit that just-right consistency. Be careful not to overdo it!
If you are feeling fancy, chop up some fresh Italian parsley and sprinkle it over the top before serving. It adds a nice pop of color and freshness. Just make sure your pasta is served hot, as it will taste best that way!