Add everything to the slow cooker. Be sure to drain the spinach well, I do this by putting the thawed spinach in a dish towel and squeezing.
Cook on HIGH for 2 hours stirring occasionally.
Notes
If your dip thickens during serving time, add a splash of milk to thin out.
Pour the melted cheese dip into an airtight container and keep it in the fridge for up to 4 days. Simply warm dip on the stovetop over medium heat until warmed throughout. Be careful not to burn it.
This queso recipe doesn't have much kick; however, if you'd like to add one, you can add jalapenos, spicy Rotel, or hot sauce. Add a little bit at a time until you reach your desired heat level.