Bring ¼ cup water to a boil in a saucepan over medium heat.
Add garlic and garlic powder and boil until water has almost evaporated, about 5 minutes.
Stir in cream and parsley and season with salt and pepper.
Mix cornstarch and remaining ¼ cup water together in a cup. Stir cornstarch mixture into sauce. Cook, stirring constantly, until thickened, about 3 minutes.
