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In a small mixing bowl, add in the flour, baking powder, and cocoa powder and whisk to combine.
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Place the butter into a heat-safe bowl and melt in the microwave for a few seconds to melt.
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Put in the low-carb sweetener and combine into the mixture until dissolves.
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Put in the egg, heavy cream, vanilla, and salt into the prepared mixture and combine using a whisk until fully incorporated.
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Gradually add the prepared wet ingredients into the dry mixture and stir until fully combined.
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Using a mug or small heat-safe container, pour in the prepared cake batter.
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Place the mug into the microwave to cooker for 1 minutes on high.
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Take the mug out of the microwave and serve right away with fresh sliced fruit like strawberries, if desired, and Enjoy!