Peel remaining apples and grate. Set aside. In a large bowl combine the flour, sugar, baking powder, ground ginger, and ground cinnamon. Add in the grated apples, milk, butter, egg, and vanilla. Beat with an electric mixer until combined. Spoon over the apples and bake until a toothpick inserted in the middle comes out clean, about 35-40 minutes. Cool on a wire rack for 10 minutes. Loosen edges and invert to a serving platter. Cool 20 minutes and serve warm.