For the Vanilla Ice Cream Base:
In a small bowl, mix the cornstarch with 2 tablespoons milk to form a slurry. Set aside. In another small bowl, mix the cream cheese and salt together. Set aside. Put the rest of the milk, cream, sugar, and corn syrup in a large, heavy bottomed pot (like a stock pot). Bring to a boil and boil for exactly four minutes (I set my phone’s timer to make sure it was accurate). It will boil and foam like crazy.