Ingredients
Method
- Mix flour, sugar, baking powder, and salt in a microwave-safe mug.
- Stir in milk, melted butter, and vanilla until smooth.
- Fold in chopped apple and cinnamon.
- Sprinkle brown sugar on top.
- Microwave on high for 60–90 seconds. Check at 60 seconds; it should spring back lightly.
- Let cool 1 minute, dust with powdered sugar if you want.