You will need:
1/4 tsp baking powder
Drizzle of honey or pure maple syrup (just make sure it’s 100% natural! None of those ‘desert’ syrups / golden syrups)
Dash of water / almond milk
Beat your egg, and mix in all of your other ingredients thoroughly in a mug you’re happy to put in the microwave. Whisk briskly with a fork until smooth (some lumps are normal!) and like cake batter. Microwave for approx. 3 minutes.
Once your microwave cake has risen, tip your mug upside down and you’ll have an instant sponge.
Serve with clementine slices and a sprinkle of cinnamon, some lemon zest or a smear of peanut butter.