Preheat oven to 400ºF; mist an 11-by-7-inch baking pan with cooking spray. Line a large rimmed baking sheet with foil.
Make topping: In a food processor, pulse first six ingredients. Add butter; pulse until mixture resembles coarse meal.
Make filling: In a bowl, toss together all filling ingredients. Transfer to pan; spread evenly. Sprinkle topping mixture over fruit.
Place pan on baking sheet and bake until top is golden, about 35 minutes. Remove pan and cool on a wire rack for 20 minutes before serving.
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