Step 1

Add all the dry ingredients to your mug and mix until well combined.

Step 2

Now add the milk, oil, sourdough starter and vanilla extract (if using) to the dry ingredients and mix really well until it forms a glossy cake batter.

Step 3

Add a teaspoon of peanut butter or raspberry jam to the top of the cake batter and push down until it's covered.

Step 4

Place the mug in the microwave for 2 minutes on high power. The sourdough mug cake is done when the cake has risen and is firm to the touch. Please be careful as it will be extremely hot when taking out of the microwave.

Step 5

Serve with vanilla ice cream or double cream.