Ingredients
Method
- Mix flour, sugar, baking powder, and salt in a microwave-safe mug.
- Add milk, oil, and vanilla; stir until smooth.
- Spoon Nutella on top in dollops.
- Use a knife to swirl Nutella gently without fully mixing.
- Microwave on high for 60–70 seconds until cake is set but still tender.
- Let cool a minute, then eat with a spoon.