Add the flour, baking powder, espresso, cinnamon and nutmeg to your mug. Using a fork, stir well to combine.
Add the pumpkin, vanilla and sugar and stir until well combined. Slowly add the milk and stir to incorporate all of the ingredients.4. Microwave on high for 2 minutes.
Remove from microwave and allow to cool for 5 minutes. (If you try to put the whipped cream on sooner, it will melt too fast).
Add whipped cream on top of the pumpkin spice latte cake and generously drizzle with caramel topping.