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1
Preheat oven to 400 degrees F (200 degrees C). Butter 2 baking sheets.
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2
Spread challah bread cubes onto prepared baking sheets. Drizzle cubes with 2 tablespoons olive oil and season with salt and pepper.
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3
Bake bread in the preheated oven until toasted and lightly browned, 5 to 7 minutes. Transfer toasted cubes to a large bowl.
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4
Reduce oven temperature to 350 degrees F (175 degrees C). Butter a baking dish with 2 tablespoons unsalted butter.
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5
Cut corn kernels from the cob into a large bowl. Scrape corn juices from the cob into the bowl with the kernels.
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6
Heat 2 teaspoons olive oil in large skillet over medium heat. Cook and stir onion and garlic in hot oil until soft, 5 to 10 minutes. Add corn, pinch salt, and pinch pepper; cook and stir until corn softens, about 2 minutes.
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7
Stir corn mixture together with toasted bread cubes.
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8
Whisk cream, vegetable stock, Parmesan cheese, eggs, 2 tablespoons parsley, pinch salt, and pinch pepper together in a bowl. Pour cream mixture into bread mixture and stir until completely combined. Transfer bread mixture to the prepared baking dish.
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9
Bake stuffing in the preheated oven until stuffing is cooked through and the top is toasted, 20 to 25 minutes.
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10
Melt 2 tablespoons butter in a small skillet over medium heat. Cook whole sage leaves in hot butter until butter is slightly brown and sage leaves are crispy, 1 to 2 minutes. Transfer leaves to a paper towel to drain. Crumble sage leaves and remaining 2 tablespoons parsley over stuffing.