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Preheat oven to 375F. Spray a 9x13-inch pan with oil.
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In a large mixing bowl, toss together peaches, blueberries, lemon juice, sugar, cinnamon, and cornstarch until all the fruit is coated. Transfer to the prepared pan. Set aside.
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In a separate mixing bowl, stir together oats, flour, salt, and brown sugar. Use a pastry cutter (or your fingers) to the pieces are about the size of peas. Sprinkle over the fruit.
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Bake 40 - 45 minutes, until the fruit is bubbly and the topping is browned.
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Serve warm with ice cream or whipped cream on top.