New York crumb cake bakes into lunchbox squares

In a second bowl, whisk together egg, milk, canola oil, and vanilla. Using a rubber spatula, mix dry ingredients into the wet ingredients. Fold in cooked apples.Spread batter evenly into prepared pan and set aside. In a medium bowl, combine remaining 2½ cups flour, brown sugar, and remaining cinnamon. Pour melted butter over flour mixture, and toss with a rubber spatula until large crum...