Step 1

Mash 1/2 banana with a fork until smooth. (You can use the same mug in which you are gonna bake the cake)

Step 2

To the cup add melted butter, milk , Vanilla extract,sugar. Mix everything well.

Step 3

Add flour, baking powder, cinnamon powder. salt and walnuts. Mix everything well.

Step 4

Microwave on high for 60 seconds (1 minute) or until the top of the cake is just set and firm to touch.

Step 5

Serve with a drizzle of chocolate sauce on top or scoop of ice cream.