"Sautéed mushrooms and onion with a little Swiss cheese are stuffed in hamburger patties to create an exciting twist on a classic flavor combo!..."
INGREDIENTS
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1 tablespoon butter
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2 cups sliced mushrooms
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1/4 cup finely chopped onion
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1 1/2 pounds lean ground beef
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1 tablespoon McCormick® Grill Mates® Hamburger Seasoning
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1/3 cup shredded Swiss cheese
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6 hamburger rolls