It's painfully easy to make apple crisps.
Slice your collection of apples as thin as you can go. Lay them on a baking tray and some baking paper and cook them in the oven (gas 3/160 C) for 45 minutes to an hour, turning them at the half way point, and until a good golden brown. Then sprinkle with an unbleached sugar and cinnamon combination (with quantities according to your sweet tooth and love of cinnamon).
According to the snack spectrum* apple crisps are a good one. Sweet enough to hit that spot and they don't cost a bomb or your health. They'll be even better for you if you have hand picked your apples or bought organic from somewhere brilliant like the General Store.
*NB. a strictly fictional chart