In a saucepan combine heavy cream, butter and cream cheese. Bring to a simmer over medium high heat, then keep it simmering until all is melted and mixed well. Stir often!
Right after the mixture comes to a light boil, whisk in the Parmesan cheese and garlic powder.
Simmer this for 5-10 minutes on medium-low heat, just until it thickens enough to coat a spoon.
Salt and pepper to taste.
Serve over hot pasta, in place of red pizza sauce, or for dipping. It's great with grilled chicken or shrimp too.
Notes
TIP: If the sauce seems to seperate, whisk rapidly on low heat to incorporate the fat back into the cream. If you find your sauce isn't thick enough, be sure to let the sauce boil for a moment before you add the cheese!