In a medium saucepan or skillet, heat the butter and red pepper flakes over medium heat.
Add the garlic and cook, stirring constantly for a minute or two. Be careful not to let the garlic burn.
Whisk in the cream and the parmesan cheese and reduce the heat to low.
Continue to cook to allow the cream to reduce and the cheese melts, about 10 minutes.
Taste the sauce and add salt, pepper and additional cheese as desired.
If not using right away transfer the sauce to a jar and keep refrigerated for about a week.