Step 1

Melt butter in a large saucepan over medium heat and cook onions until soft, about 3-5 minutes. Add garlic and cook an additional minute. Add cornstarch and whisk for 1 minutes. Gradually add half-and-half whisking constantly until incorporated. Let it come to a boil and then turn down heat.

Step 2

Add grated cheese and stir until melted. Add diced hatch chilies. Add cayenne if desired and salt and pepper to taste.