Directions: Place a rack in the middle of the oven and preheat to 350ºF. Butter an 8-inch square baking dish with 2-inch sides.
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To make the topping: In a medium bowl, mix together the flour, brown sugar, oats, and salt. With a pastry blender or two knives used scissor-fashion, cut in the butter until the mixture resembles coarse meal.
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To make the filling: Toss together all the ingredients until well mixed and spoon into the prepared dish. Sprinkle the topping evenly over the filling. Set the dish on a baking sheet to catch any drips.
Bake for about 1 hour, or until the topping is golden and the filling thickens and bubbles. Cool at least 20 minutes. Serve with vanilla ice cream, if desired.
