In a small saucepan, combine cheddar cheese and cornstarch. Toss until cheese is evenly coated.
Stir in evaporated milk and salt. Heat over medium heat, whisking occasionally, until cheese is melted and smooth, about 3 to 5 minutes. Reduce heat to low, cover, and keep warm until serving time.
Notes
Cheese can be transferred to a slow cooker and kept warm