Add the cheese slices to the slow cooker. Pour over the milk.
Cook on HIGH for 2 hours, stirring occasionally. You know the cheese sauce is done when the cheese sauce is silky smooth, and has no cheese stretch to it. The cheese sauce needs to be hot to get to this point.
Serve with chips and enjoy!
Notes
Nutritional values do not include chips.
The spice level can easily be adjusted up by adding fresh diced jalapenos.
Transfer any leftover queso to an airtight container and refrigerate for up to 3-4 days. To reheat, simply microwave in 30-second intervals, stirring occasionally, until warmed through.
While you can freeze queso, the texture may change slightly upon thawing. To freeze, transfer the dip to a freezer-safe container and store for up to 2-3 months. Thaw overnight in the refrigerator before reheating.