Keto Mug Cake Cookbook: 21 Low Carb Recipes For Your Microwave. It doesn't matter if you're craving chocolate cake, pumpkin spice cake, or lemon cheesecake. Now you can have your keto mug cake and eat it too! With over 21 recipes for everything from classic sponge cakes to decadent brownies; this keto mug cake cookbook is perfect for any baker with a microwave.