Sheet Pan Cheesesteak Nachos

Bahan-bahan (6 porsi)

• Canola or vegetable oil, for frying
• 8 flour tortillas, cut into eighths (see note)
• 1 large white onion (about 10 ounces; 285g), thinly sliced
• Kosher salt and freshly ground black pepper
• 2 pounds (900g) boneless ribeye or sirloin steak, frozen for 2-3 hours
• 8 slices provolone cheese
• 8 ounces (225g) shredded cheddar cheese (about 2 cups)
• 1 tablespoon cornstarch
• 1 can (12 ounces; 355 ml) evaporated milk
• 2 teaspoons (10ml) distilled white vinegar
• 1/2 teaspoon (3ml) Worcestershire sauce
• Sliced hot deli-style cherry peppers, for garnish
• Thinly sliced green onion, for garnish