Cook the pasta following the instructions on the box. Drain the water and set aside. I like to make the sauce as the pasta cooks, so they finish together and can be combined right away.
Make the sauce:
Over medium heat, melt the butter in a skillet with sides. Add the minced garlic and cook, stirring, until it turns golden, about 1 minute. If using garlic powder, melt the butter, add the powder, and immediately proceed to the next step.
Pour in the cream or half-and-half and milk, stirring constantly. Add the grated Parmesan cheese, salt, pepper, and nutmeg (if using) and combine. Bring the sauce to a light simmer, and then reduce the heat to low and continue cooking the Alfredo sauce for about 5 minutes.
Combine:
Add the pasta to the skillet and use tongs to combine it with the Alfredo sauce. Serve it with additional Parmesan cheese on top.
Notes
You can also use ½ teaspoon of garlic powder if you don’t have a clove.