Add dry ingredients to mug and mix well. Add the egg and mix thoroughly. Pour in the milk and oil and mix well. Add the chocolate chips and vanilla extract and mix again. Put the mug in the microwave and cook on high for 2 minutes. The cake may rise over the top of the mug, but don't be alarmed! Allow to cool a little, and tip out onto a plate if desired. Vegetarian, Ready in 5 minutes, recipe by Elyse Jacobs Nutritional Information1 Serving: Calories 354; Fat 21g (8% calories from fat); Protein 6g; Carbohydrate 37g; Dietary Fiber 3g; Cholesterol 90mg; Sodium 43mg.