Preheat oven to 350°F.
In a large bowl beat the eggs with the milk, butter and vanilla. In separate bowl, combine flour, sugar, baking powder and cinnamon. Add to egg mixture and stir just until moistened (do not overmix.) Stir in apples.
Pour into prepared pan. Bake 30 minutes or until toothpick inserted in center comes out clean. Cool in pan on cooling grid 5 minutes; remove from pan and cool completely.