Flourless Chocolate Pudding Cake With Pumpkin Spice Custard

"This vegan chocolate pumpkin flourless mug cake is the ultimate fudgey but healthy indulgence. Low fat but tastes SO luxurious, and made in just minutes! The cake is made with just 5 simple ingredients--no oil, no sugar, no gluten. And it only take 2 minutes in the microwave to go from batter to baked. Fudgey pudding-meets-cake richness made even more scrumptious with the addition of a creamy pumpkin spice custard on top. This recipe makes enough for two, so you can share with a pumpkin-loving friend!"