In a small bowl, whisk together egg replacer mixture and pumpkin puree. Stir in the milk, vanilla and sugar.
Add the flour, salt and spices. Mix until smooth. Fold in the chopped nuts.
Pour the batter into a mug and microwave for 11/2~21/2 minutes or until the cake is risen and firm.
Top with some whipped cream, caramel sauce and more chopped nuts. Serve immediately!!