Gather all ingredients. Preheat the oven to 375 degrees F (190 degrees C).
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Toss pears and lemon juice together in a bowl until coated; spread into a 9x9-inch baking dish. Pour maple syrup and 2 tablespoons melted butter over pear mixture; toss to coat.
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Mix oats, brown sugar, 1/2 cup melted butter, flour, and cinnamon together in a bowl until crumbly; sprinkle over pear mixture.
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Bake in the preheated oven until crust is golden and pears are tender, about 45 minutes.
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