Cheeseburger Dip

Ingredients

• 12 lb sharp cheddar cheese
• 12 lb mild cheddar cheese (use block cheese from the deli, not slices or shredded) or 12 lb American cheese (use block cheese from the deli, not slices or shredded)
• 2 teaspoons cornstarch
• 1 tablespoon vegetable oil
• 1 lb ground beef
• kosher salt
• fresh ground black pepper
• 12 teaspoon ground cumin
• 12 teaspoon red pepper flakes
• 1 (10 ounce) can Rotel tomatoes & chilies
• 5 ounces evaporated milk
• 1 teaspoon frank's hot sauce (optional)