In a 300ml microwave-safe mug, add all-purpose flour, baking powder and castor sugar. Using a fork, combine everything together.
Then pour milk and oil into the mug. And give it a good mix. Make sure there are no lumps.
Add mango essence and chopped cashews. Mix again.
Once the cake batter is mixed, pour mango jam at the centre. Using a fork, bring the batter from the sides to the top of the jam. Cover it properly.
Microwave it for 1 minute. Then check if it is fully baked. The cake should feel fluffy and springy to the touch.
If the cake hasn’t set then microwave it in 10-second intervals until cooked through. But don’t overdo it. As it might become too dry or burn.
Every microwave is different. So I will suggest you start with 1 minute and then continue microwaving it in 10-second intervals. My microwave is 900W and it took 1 minute and 40 seconds to bake this mug cake.
Then take it out of the microwave and let it cool down for a couple of minutes. Then it is ready to be devoured!