Finely grate parmesan cheese. I recommend starting with a block of parmesan cheese rather than the pre-packaged shredded parmesan. If you only have pre-shredded cheese, I would run it through a food processor to make sure it is finely shredded so it will melt better into the sauce. I strongly discourage you from using the powdered cheese in a shaker for this recipe.
Melt butter on medium heat in a skillet. You can cut the butter into pieces to speed up the process.
Once the butter is melted, add minced garlic and cook until the garlic is fragrant (around two minutes).
After the garlic is cooked, add the heavy whipping cream and bring to a simmer, stirring frequently to make sure your cream doesn't burn.
Once the cream comes to a boil, reduce heat to medium low and simmer for 5 minutes, stirring frequently.
After the cream is done simmering, slowly add the grated parmesan cheese stirring constantly until melted and incorporated into the sauce.
Serve and enjoy!