Liv's Applesauce Mug Cake

3 TB flour
1 heaping TB brown sugar
1/2 tsp cinnamon
1/8 tsp baking powder
1 TB applesauce
1/2 TB vegetable oil
1/2 TB milk
1/8 tsp vanilla extract

Crumb topping:
1 TB butter
2 TB flour
1 TB brown sugar

Bake for 1 min (or 1.5 min) in the microwave.