Combine the coconut milk, erythritol, and cornstarch in a saucepan; give it a good stir. Whisk vigorously until the sugar has dissolved.
Slice the vanilla pod in half and scrape out the seeds. Add 1/2 of vanilla pod and seeds to the saucepan. Bring to a simmer over medium heat for about 5 minutes (Make sure to stir continuously using a wire whisk to avoid lumps).
Remove from heat. Pour your Crème Brulee into 2 ramekins (or 2 serving bowls). Place in the refrigerator to set for at least 4 hours.
Before serving, sprinkle the top of each custard with 1 tablespoon of granulated sugar. Use a kitchen torch to caramelize the sugar and create a crispy top coating.