Preheat oven to 350 degrees. Combine flour and next 4 ingredients in a large bowl, stirring with a shisk. Make a well in center of mixture. Combinw milk, melted butter, vanilla, and egg, stirring with a whisk; add toflour mixture, stirring just until moist. Fold in apple. Pour batter into a 8in. square baking pan coated with cooking spray.
To prepare streusel, combine brown sugar, flour, and cinnamon; cut butter with 2 knives until mixture resembles coarsemeal. Sprinkle streusel evenly over batter. Bake for 45 min.
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