Diner Style Patty Melt

Ingredients

• 1 pound ground beef chuck (20% fat), or meatless substitute
• 1 teaspoon kosher salt
• 1/4 teaspoon freshly ground black pepper
• 8 slices rye bread
• 2 tablespoons vegetable oil, divided
• 1 large onion, sliced into 1/4" rounds
• 8 thin slices cheddar, American, or Swiss cheese
• 8 teaspoons mayonnaise, divided

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