First, spray the slow cooker with non-stick cooking spray.

Then, whisk cornstarch into the milk until it dissolves. Pour into the slow cooker and then add the rest of the ingredients. 

Mix everything together and then cover the slow cooker.

Cook on low for 1.5 to 2 hours stirring every 15-30 minutes to be sure the edges don’t burn. We recommend NOT cooking this on high as it can easily burn.

When there is about 15 minutes left of cook time bring a large pot of water to a boil and add the pasta to the boiling water. 

Add the pasta to the water and then cook until the pasta is al dente. 

Strain the water from the pasta and set the pasta aside. 

Finally, when all the cheese is melted and smooth, stir and turn the slow cooker to warm. 

Add the pasta to the slow cooker and stir until all of the pasta is covered in the queso. 

Serve with scoop of salsa or guacamole on top.