If you want a little extra spice to the queso, add some chipotle or cayenne powder. Or diced jalapeños if you like (it will just change the smoothness of the dip texture).
If the dip is a little thicker than you prefer after melting the cheese (different brands and types will vary after melting), whisk in a little regular milk to thin to your desired texture. You can also use more evaporated milk, but we prefer not to have to open another can for such a small amount.
In a bowl, toss together the shredded cheese, corn starch, chili powder, ground cumin, garlic powder, onion powder, and salt. Make sure everything is combined well.
Taste the sauce and add additional seasonings and/or optional chipotle or cayenne to your preferred taste. Top with the optional green onions.
Serve with tortilla chips, on french fries, or with whatever you can imagine this delicous cheese going well with.