1. Melt the butter in a microwave safe mug on lower power.
2. Whisk in the applesauce, egg, vanilla and maple syrup until well combined
3. Add almond meal, cinnamon, baking powder, and salt and stir for about 30 seconds.
4. Combine streusel topping ingredients. Using your fingertips, sprinkle the mixture on top before microwaving.
Microwave for 1 minute, 10 seconds