mug; flatten 1/2 the crumble mixture into the bottom to form a crust.
microwave crust for 30 seconds on high.
remove mug from microwave; add 1 dash cinnamon, apple slices, and brown sugar. add water. mix apples, brown sugar, and cinnamon together carefully without disturbing crust. pour remaining crumble mixture on top.
microwave for 1 minute and 50 seconds on 60% power. remove from microwave; let cool about 1 minute.
if you like a tart apple crisp, then you can use less sugar. the amount you take out is up to you based on how sweet you like it. you may want to give the original recipe a try before messing with how much 