"Homemade hamburgers are perfect for Summer cookouts, backyard parties, potlucks and so much more! Everyone loves these flavorful caramelized onion burgers!..."
INGREDIENTS
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1 large sweet onion (diced)
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1 tbsp olive oil
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1 tbsp butter
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1.5 lb ground beef (preferably 85% chuck)
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1 tbsp mayo
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2 tsp seasoned salt (divided)
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½ tsp garlic powder
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¼ tsp black pepper
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4 slices provolone cheese