Combine together the sweetener and cocoa powder. Put the bowl aside.
Prepare another bowl to beat the eggs in. Whisk until soft so that the lava cake will rise when baking.
Pour the beaten egg into the sweetener and cocoa powder. Include the baking powder, vanilla, and cream into the mix as well. Stir together then flavor with salt.
Coat 2 muffin cups with cooking spray. Gently pour and distribute the batter into the cups. Let it bake in the oven for 10 minutes. Remember not to overbake the lava cake to obtain the soft consistency in the center.