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Preheat oven to 350°.
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Place oats in a food processor; process until finely ground. Place in a large bowl.
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Add flour, sugar, baking powder, salt, and ginger to oats; stir well with a whisk.
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Combine 2 tablespoons water and eggs; stir with a whisk.
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Add egg mixture to oat mixture, and stir well.
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Stir in pecans.
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Turn dough out onto a lightly floured surface; knead lightly 7 times.
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Shape dough into 2 (8-inch-long) rolls.
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Place rolls 3 inches apart on a baking sheet coated with cooking spray; flatten dough to 1 inch thick.
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Bake for 30 minutes.
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Remove rolls from baking sheet; cool 10 minutes on a wire rack.
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Reduce oven temperature to 325°.
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Cut each of the rolls diagonally into 10 slices. Place, cut sides down, on baking sheet.
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Bake for 10 minutes.
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Turn cookies over; bake an additional 10 minutes (cookies will harden as they cool).
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Remove from baking sheet; cool completely on wire rack.
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Combine chips and oil in a small microwave-safe bowl.
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Microwave at high temperature 30 seconds or until chips melt; stir gently.
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Drizzle over biscotti.