In a medium saucepan over medium heat, melt the unsalted butter.
Add the minced garlic to the melted butter and cook for 1 minute, stirring constantly, until fragrant.
Slowly pour in the heavy cream while whisking continuously until well combined.
Bring the sauce to a gentle simmer over medium-low heat. Cook for 5 minutes, stirring often.
Add the salt and ground black pepper to the sauce. Stir well to combine.
Gradually whisk in the freshly grated Parmesan cheese until the cheese is fully melted and the sauce is smooth. If the sauce is too thick, add a splash more of heavy cream to loosen it.
Adjust salt if needed. Remove the sauce from heat. Serve immediately over cooked pasta or steamed vegetables.