Core the Apple.
Cinnamon, brown sugar, pinch of salt, butter. Add nuts or raisins or other dried fruits to your taste and put all ingredients in the center of the apple.
Microwave 5–8 mins.
You need a bowl, mug, or dish deep enough to hold the apple and be able to cover when cooking to prevent splatter.
I sometimes take two bowls and turn one upside down to use for a cover.
If you want to be real decadent, after cooking pour over some cream or ½ and ½. Delicious.