microwave bread pudding in a mug

Not a cake, but I have made a microwave bread pudding in a mug: 1 egg 1/4 cup coconut 1/2 cup milk 2 Tablespoons sugar 1 Tablespoon butter or margarine, softened 1/2 teaspoon vanilla extract Fill the mug with pieces of stale bread. I sometimes use old frozen hamburger buns dried out under the broiler. Mix together the above list of ingredients and pour over the pieces of bread, soaking them thoroughly. You may need to adjust the ingredient measurements, depending on the size of your mug. Microwave for about 3 minutes. Sprinkle with cinnamon. Maybe a little whipped cream.