In a container, combine unsweetened cocoa powder, vanilla allulose, and an egg, then mix well until a thick batter forms.

Line a microwave-safe container with parchment paper and pour in the batter.

Microwave the batter for 1 minute. Be careful as the container will be hot.

Immediately after microwaving, while it's still hot, wrap the cookie in plastic wrap.

Refrigerate the wrapped cookie for one hour to achieve a dense, fudgy texture.

Your fudgy no-flour chocolate cookie is ready to be enjoyed.