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Mix ground turkey, bread crumbs, and half the barbecue sauce.
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Shape mixture into four patties, 1/2 inch thick.
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Grill until done.
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Meanwhile, cut onion in half lengthwise, then cut crosswise into 1/4-inch slices.
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Separate into half-rings.
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Heat nonstick skillet over med-high heat.
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Add onion, cook 2 minutes, stirring frequently.
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Reduce heat to medium; cover and cook 2 minutes.
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Stir in remaining barbecue sauce.
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Reduce heat to med-low and cook 5 minutes longer or until onion is wilted and sauce thickens.
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Serve burgers on buns, smothered in onions and extra barbecue sauce.