In a small microwave safe bowl put the cheese and milk and microwave it for 5 minutes so it melts and a sauce forms. In the middle of this take it out and mix using a spoon, then put it back in for the remaining 2 and a half minutes.
Put the tortilla chips on a big plate with walls. Pour the hot chili on top and then the cheese sauce.
If you so desire to you can add lime juice, salsa or guacamloe. ¡Ready!