Prefer Egg Yolks? You can substitute 2 egg yolks for the egg, if preferred. It doesn't thicken quite as much, but does produce a silkier texture.
Sweetener Options: Simple cane sugar produces the "cleanest" taste. You can substitute another sweetener, like maple syrup or honey, but it does heavily influence the flavor. We have not tested this recipe with a sugar-free substitute. They do tend to perform differently in recipes.
Milk Alternatives: You can use another dairy-free milk beverage, but keep in mind that the results might be thinner, and some brands and types can curdle. I prefer a two-ingredient soymilk (soy and water) with no added thickeners or other ingredients (like WestSoy or Trader Joe's) or a simple lite canned coconut milk.
Starch Options: Cornstarch is ideal for dairy-free custard. But if you need corn-free, you can substitute arrowroot starch. If you prefer to use flour, double the amount - use 2 tablespoons.