Add the butter and cream cheese to a large bowl. Cream the mixture with an electric mixer until evenly combined, a couple minutes. Start by adding just two tablespoons of sweetener, adding more if necessary to taste. Continue to beat until light and fluffy, about 8 minutes.
Spoon into silicon moulds or pipe as you would with frosting (I used a star tip). Freeze until hardened.
If adding a chocolate layer, melt chocolate in a water bath (or the microwave), feel free to add a touch of coconut oil to thin it out. Allow it to come to room temperature before coating. Drizzle it over the fat bombs or dip them in using two forks. Freeze again straight away.
Notes
Please note that nutrition facts were estimated for the ENTIRE batch. You can make approximately 50 fat bombs (at 0.1g net carbs a pop).But given that the yield will depend on how many fat bombs you get, DIVIDE EVERYTHING IN THE NUTRITION FACTS BY YOUR NUMBER OF FAT BOMBS! Sorry for the caps ;)!