In a medium saucepan, melt the butter over medium heat.
Add the minced garlic and sauté for about 1 minute until fragrant, being careful not to burn it.
Pour in the heavy cream and bring the mixture to a gentle simmer.
Reduce the heat to low and gradually whisk in the grated Parmesan cheese until fully melted and the sauce is smooth.
Season with salt, black pepper, and nutmeg if using. Stir well and cook for another 2–3 minutes until the sauce thickens slightly.
Remove from heat and serve immediately over cooked pasta.
Notes
For best results, use freshly grated Parmesan cheese instead of pre-grated. The sauce will thicken as it cools, so adjust consistency with more cream if needed.