Peel, core and slice the apples, keeping them under a damp paper towel until all are ready.
Crush the ginger snaps.
Place sliced apples in ungreased 13x9-inch baking pan.
Combine ¾ cup sugar and ½ teaspoon cinnamon in bowl; sprinkle over apples.
Combine flour, sugar, eggs, baking powder, cinnamon, and salt in bowl; beat at medium speed as you add the vanilla, until mixture resembles coarse crumbs.
Spoon this over the apples. Sprinkle the crushed ginger snaps over that.
Carefully and slowly pour melted butter over everything. If you pour too fast it will just run over and on to the counter. Let it sink into the topping as you pour.
Place this baking dish on a large tray for the oven. This will catch any boil overs and much easier to clean.
Bake 45-55 minutes or until lightly browned and apples are tender.
Serve warm either with or without a topping or ice cream.