Preheat oven to 350 degrees.
Peel, chop, and remove the seeds from apples (or zucchini).
(When Using Zucchini Only) Add lemon juice to the zucchini.
Add sugar, vanilla, and cinnamon to the apples (or zucchini).
Mix well and pour mixture into a greased baking dish (8x8 or slightly larger).
In a separate bowl, combine oats, flour, brown sugar, baking soda, and baking powder.
Using a fork or pastry blender, mix the shortening or lard in with the oat mixture until it is crumbly.
Spread the mixture over the apples (or zucchini) in the pan.
Bake in a 350 degree oven for 30 minutes.