Preheat oven to 350 deg. Peel, core and slice thin enough apples to make pan 1 1/2 to 2 inches deep. (For variation, sprinkle fruit of choice or as listed below over apples, or use other fruits instead.) Sprinkle tapioca pearls all over the top and sides. Sprinkle cinnamon over top and then sprinkle brown sugar over this.
In a large bowl, cut butter into flour. Add sugar and baking powder, Mix well. Add eggs and mix well. The dough is very stiff so you must spread it out with your fingers before putting it on top of the apples.
Bake in a 9x12-inch dish for 40-45 minutes, until topping is golden brown.