In a small food processor, combine all the wet ingredients and process until smooth and well combined.
In a seperate bowl, combine all the dry ingredients and mix with a whisk until well incorporated.
Add wet ingredients to the dry ingredients and mix with a wooden spoon or spatula until well incorporated.
Transfer to a microwave safe bowl (allow room for rising, your cake will pretty much double in volume) cover with a paper towel and cook in the microwave on high for about 3 minutes.
As soon as your cake comes out of the microwave, garnish with a dollop of plain yogurt, a drizzle of hazelnut butter and a few hazelnuts if desired and serve immediately.