I guess the term "oil" made me wonder how it can be firm enough to be a base for a chocolate bar. Does your chocolate have to be kept refrigerated to avoid melting into a puddle?

It is solid at room temperature, but melts just a few degrees warmer. The chocolate does need to be refrigerated. The following is a delicious recipe I've used. I typically cut down on the cacao powder. Obviously for a low-carber you'd want to eliminate the honey. I will often add Stevia for sweetness. I also toast the coconut and mix it into the balls soemtimes.

1.5 Cups Raw Cacao Powder
1 Scoop High Quality Protein Powder (MRM or Vega Sport)
1/2 Cup Raw Honey
1 Tsp Vanilla
1-2 Tbsp Natural Peanut or Almond Butter
1/4 Cup Melted Extra Virgin Coconut Oil
1/4 Cup Shredded Coconut (set aside in separate bowl)

Mix all ingredients together in medium size bowl. Roll into uniform balls. Roll formed balls in shredded coconut. Refrigerate.