The problem with apple desserts is that typically you’d have to do the not-easy part of coring/peeling/slicing them. You could make applesauce of the type where you cook the whole apples and then put through a food mill/strainer?
That said, the easiest fruit dessert I know is what I call “FAAST" crisp:
F - fruit, peeled and chopped
A - alcohol, choose a wine or liqueur you like that matches
A - acid, like lime/lemon juice or perhaps balsamic vinegar
S - sweetener, choose one that goes nicely
T - thickener, my favorite is tapioca but my kids like agar (vegan gelatin)
Basically, you microwave all of the above together until it is all cooked, and put it in a pan.
Then mix together a smashed stick of butter, about a cup or cup and a half of oats, and maybe half a cup of brown sugar. Sprinkle that on top, and bake the whole thing at 350 F until it looks done.
With apples, I’d suggest white wine or maybe Sabra as the alcohol, lemon juice as the acid, brown sugar or honey as the sweetener, and tapioca as the thickener.
(My favorite was once with plums, limoncello, lime juice, maple syrup, tapioca)