In large mug add butter and melt In microwave for 30 seconds.
2 tablespoons butter
Add the egg yolk, milk, and vanilla. Whisk together.
1 egg yolk, 1 tablespoon milk, 1 teaspoon vanilla
Add in flour, sugar, baking powder and cinnamon. Whisk together till smooth.
1/4 cup all-purpose flour, 2 tablespoons sugar, 1/2 teaspoon baking powder, 1/2 teaspoon ground cinnamon
Stir in carrot and walnuts.
1 tablespoon shredded carrots, 1 tablespoon walnuts
Microwave for 1 minute or until cake pulls away from sides of mug.
Mix cream cheese, powdered sugar and milk together. Pour over cake.
1 tablespoon cream cheese, 1 teaspoon powdered sugar, 1 teaspoon milk
Serve warm and ENJOY!