Bring a large pot of generously salted water to a vigorous boil. Add your fettuccine and cook according to package directions until al dente—about 8-10 minutes. Before you drain the pasta, scoop out and reserve 1 cup of that starchy, golden pasta water. This liquid gold is your secret weapon for perfecting the sauce consistency.
While the pasta cooks, combine the cottage cheese, freshly grated Parmesan, chopped garlic, milk, salt, pepper, and a tiny pinch of nutmeg (if using) in a high-speed blender. Blend on high for a full 60 seconds, scraping down the sides once, until the mixture is utterly smooth, silky, and looks like thick heavy cream. No lumps allowed—this is the moment where the magic happens.
In a large, wide skillet or sauté pan, melt the butter over medium heat. Let it foam gently, then swirl the pan until it turns a light, nutmeg-colored brown—about 2 minutes. This browned butter step adds a toasty, caramelized depth that completely elevates the sauce, but you can simply melt the butter if you’re short on time.
Add the pasta water reserved earlier and blend for another 30 seconds until smooth. Taste and adjust seasoning if needed. Pour the sauce back into the pan and let it simmer over medium-low heat for a couple of minutes to thicken slightly, stirring occasionally.
Serve the creamy pasta noodles in a bowl and garnish with fresh parsley or basil. Sprinkle extra Parmesan cheese on top if desired.