In a double boiler combine unsalted butter and unsweetened baking chocolate. Melt and stir to combine ingredients. Add erythritol, salt, instant coffee, and xanthan gum. Use a rubber spatula to stir until the chocolate mixture has absorbed the dry ingredients.
Remove from heat and add eggs, combine using an electric mixer. Mix in almond flour and unsweetened cocoa powder.
Remove from heat and add eggs, combine using an electric mixer. Mix in almond flour and unsweetened cocoa powder.