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Heat burgers in microwave according to package directions. |
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Cut onion into 1/4-inch thick slices. Heat butter in a large skillet over medium heat. Grill onions about 2 minutes on each side, until soft and golden. |
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Meanwhile, split green chilies and lay flat over top of burger patty. Lay 1 slice cheese over each; return to microwave briefly to melt cheese. |
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Heat buns in microwave or oven until warm. Spread salsa on buns. |
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Place burger patties on buns and top with grilled onions |