Mix the sugar and cornstarch together in a small bowl. Mix together well to break up any cornstarch clumps.
½ Cup Granulated Sugar, ¼ Cup Cornstarch
Add the oatmilk, vegan heavy cream and salt to a 2 quart saucepan.
¾ Cup Oat Milk, ¾ Cup Vegan Heavy Whipping Cream, ¼ teaspoon Kosher Salt
While whisking, slowly stream the cornstarch mixture into the saucepan.
Place the pan over medium heat and whisk constantly (see note) until the mixture comes to a full boil, then still whisking constantly, boil the mixture for 1 minute.
Immediately pour the mixture into a fine mesh strainer that is fitted over a bowl, pressing the mixture through with a spatula. (See note)
Mix the vanilla into the custard and cover the bowl with plastic wrap, making sure the plastic touches the top of the custard to prevent a skin from forming. Place in the refrigerator until completely cold, about 2 hours.
1 ½ teaspoon Vanilla Extract
Once the custard is cold, remove the plastic wrap and whisk until its smooth and creamy. (See note)
Use as desired.