1 cup monterey jack cheese or 1 cup asadero cheese or 1 cup chihuahua cheese, shredded fine
4 ounces green chilies
1/4 cup half-and-half
2 tablespoons onions, chopped fine
2 teaspoons ground cumin
1/2 teaspoon salt
1 serrano pepper, chopped fine (optional)
1 tablespoon fresh cilantro, chopped fine (optional)

Put all ingredients in a double boiler and heat on medium. Cook until melted and well blended, stirring occasionally. Serve with fresh tostadas or hot flour tortillas.