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Heat oven to 400º F.
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Lightly coat a 9-inch pie plate with vegetable cooking spray. Peel, core, and cut into eighths and arrange them in the pie plate.
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Combine 1/2 cup minus 2 tablespoons sugar, flour, eggs, whole milk, vanilla, unsalted butter, and a pinch of salt in a blender. Pulse until smooth, about 30 seconds.
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Pour over the pears. Place in the oven and bake until springy to the touch, 25 to 30 minutes. Remove from oven.
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Heat broiler. Sprinkle the pancake with ground cinnamon and the 2 tablespoons sugar. Broil until browned, about 1 minute. Serve warm.