To a mug, add the unsalted butter and cannabis butter (at room temperature), and microwave for about 5 seconds. You want the butters to be soft. Add the sugar, and mix well.
Mix in the applesauce, vanilla, flour, baking powder and pinch of salt. Stir until just combined.
To make the crumble topping, in a separate small bowl, mix together the flour, butter, brown sugar and cinnamon with a fork. When the mixture starts to clump together, pour it on top of the cake batter.
Microwave for 1 minute and 10 seconds. Eat while warm, and enjoy!