Preheat oven to 350 degrees F. Spray and line the bottom of a 8x8 springform pan with parchment paper.
Seperate egg whites & yolks.
In a sauce pan over a low heat, melt butter and chocolate. Add cocoa powder, salt, and peppermint extract.
Using an electric mixer, whip egg yolks with powdered monkfruit until light and fluffy.
Add melted chocolate mixture into egg mixture 1/4 at a time until combined, batter will be thick.
Whip egg whites in a seperate bowl until soft peaks form. Gently fold chocolate batter into egg whites.
Pour mixture gently & evenly into prepared pan. Bake for 22-25 minutes.
Once cooled, dust with additional cocoa powder. Best served warm.