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Preheat oven to 350°. Toss together first 3 ingredients in a large bowl. Transfer mixture to a lightly greased (with cooking spray) 13- x 9-inch baking dish.
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Split vanilla bean, and scrape seeds into granulated sugar. (Rub the sugar between your fingers to distribute the vanilla bean seeds evenly.)
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Sift together flour, next 2 ingredients, and granulated sugar mixture into a large bowl. Stir in lemon zest. Whisk together milk, egg, and vanilla extract; stir into dry ingredients. Stir in melted butter.
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Pour batter evenly over fruit; place dish on a baking sheet.
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Bake at 350° for 1 hour and 5 minutes to 1 hour and 15 minutes or until crust is dark golden brown and done in center.