Steak Sandwiches with Honey Garlic Mayo and Seared Red Onions

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Cooking spray

1 red onion, sliced into 1/4-inch thick rounds

Cooked flank steak slices, about 12 ounces

4 to 6 slices Swiss cheese

1/2 cup mayonnaise

2 tablespoons honey

1 teaspoon garlic flakes

Salt

Freshly ground black pepper

4 long rolls