INGREDIENTS
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•1 cup chopped onion
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•1 garlic clove, minced
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•5 tablespoons unsalted butter
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•1/2 cup all-purpose flour
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•1 teaspoon salt
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•Freshly ground pepper
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•2 cups milk
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•3 large sweet potatoes, peeled and shredded (about 4-1/2 cups)
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•2 teaspoons prepared horseradish
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•2 cups (8 ounces) shredded sharp cheddar cheese
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•1 cup panko (Japanese) bread crumbs