1. Add 1 egg, 1 tablespoon cocoa powder, 3 tablespoons allulose, and 4 tablespoons water to 40 grams of oatmeal. Microwave for a total of 3 minutes, 1 minute at a time, then refrigerate for 3 hours to set.
2. Mix 2 tablespoons Greek yogurt, 3 tablespoons allulose, and 0.5–1 tablespoon cocoa powder to make chocolate cream.
3. Spread the chocolate cream on the chilled cake and enjoy.