Super Creamy Queso Dip

Name: Super-Creamy Queso Dip
Ingredients: 2 cloves garlic; 1 small yellow onion; 2 medium tomatoes; 2 tablespoons coarsely chopped fresh cilantro; 1 small jalapeño pepper; 8 ounces sharp cheddar cheese (NOT shredded); 1 tablespoon cornstarch; 2 tablespoons unsalted butter; 1 (7-ounce) can diced green chilies; 1 (12-ounce) can evaporated milk; 1/2 teaspoon teaspoon kosher salt; 1/4 teaspoon ground cumin; 1/4 teaspoon freshly ground black pepper; Tortilla chips, for serving