*This post may have affiliate links, which means I may receive commissions if you choose to purchase through links I provide (at no extra cost to you). This keto chocolate chip mug cake is gluten-free, sugar-free, and of course, low carb! It’s easy to make and takes less than 3 minutes. The texture is fluffy, moist, and cakey. Ingredients for this keto chocolate chip mug cake 1 tbsp salted butter (or you can substitute with 1 tbsp coconut oil) 1 egg yolk (It’s important that you put the egg…