This Healthy Avocado Lemon Cake in a Mug is a fast, easy and delicious breakfast, snack or dessert. It’s the perfect all season treat made with real food ingredients such as flour, coconut, sugar, baking powder, mashed avocado, coconut oil, milk, lemon zest, and Finally Vanilla ice cream. The recipe for Avocado Lemon Mug Cake is quite simple and easy.