1. Add the cubed white American cheese to the slow cooker.
2. Pour in the half-and-half or milk, which will help to create a smooth texture.
3. Mix in the diced green chiles; these will give the queso a mild heat and a pop of flavor.
4. Season the mixture with chili powder, ground cumin, garlic powder, and onion powder for depth and complexity.
5. Stir everything together gently until well combined.
6. Set your slow cooker to low heat and cook for 2 hours, stirring occasionally to ensure that the cheese melts evenly and the flavors meld together.
7. Once the cheese is completely melted and the queso is hot, taste and add salt if necessary.
8. If preferred, sprinkle chopped fresh cilantro over the queso before serving as a fragrant garnish.
