Mix the ¾ teaspoon xanthan gum, 2 tablespoons dry milk powder, ¾ cup granulated sugar, and pinch of salt in a small bowl.
Pour the 1 ½ cups whole milk into a saucepan, then drizzle in the 2 tablespoons corn syrup.
Heat the milk mixture over medium heat. Dump in the sugar mixture and whisk vigorously until the sugar dissolves, 2 to 3 minutes.
Slide the saucepan off the heat and whisk in the 1 ½ cups heavy cream.
Stir in the 1 tablespoon vanilla extract.
Pour the ice cream base into a bowl, cover with plastic wrap, and chill in the refrigerator for at least 4 hours or, for better flavor and texture, overnight (8 to 12 hours).