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1
To cook the steaks, preheat the broiler.
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2
Brush both sides of each steak with the oil and season both sides with the salt.
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3
Rub one side of each steak with the spice rub and place the steaks, rub side up, on a broiler pan.
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4
Broil until the top of each steak is golden brown and slightly charred, 4 to 6 minutes.
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5
Turn the steaks over and continue broiling to medium-rare, 4 to 6 minutes.
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6
Remove from the heat and let rest for 5 minutes before serving.
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7
To make the cheese sauce, melt the butter in a medium saucepan over medium heat.
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8
Whisk in the flour and cook for 1 minute.
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9
Slowly whisk in the warm milk and cook, whisking constantly, until thickened, 4 to 5 minutes.
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10
If the mixture is too thick to pour easily, thin it with a little extra milk.
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11
Remove the mixture from the heat and whisk in the provolone, Parmesan, salt, and pepper.
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12
Ladle some of the cheese sauce onto 4 large dinner plates.
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13
Place the steaks on top of the sauce, top each steak with some of the caramelized onions, and drizzle with a few tablespoons of steak sauce if desired.
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14
Garnish with parsley.
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15
Heat the butter and oil in a large saute pan over medium heat.
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16
Add the onions, salt, and pepper and cook slowly, stirring occasionally, until golden brown and caramelized, about 45 minutes.
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17
The onions can be made in advance, covered, and refrigerated for up to 2 days.
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18
Reheat before serving.
