**Heat the Milk and Cream:** In a medium saucepan over medium-low heat, combine the milk and heavy cream. Warm the mixture, but do not let it boil.

**Melt the Cheese:** Gradually add the shredded or cubed white American cheese to the saucepan, stirring constantly until fully melted and smooth.

**Add Flavorings:** Stir in the diced green chilies, garlic powder, onion powder, cumin, chili powder (if using), and salt. Mix well to incorporate all the flavors.

**Adjust Consistency:** If the dip is too thick, add a splash of milk to reach your desired consistency. Continue stirring to ensure a creamy texture.

**Serve:** Transfer the dip to a serving bowl, garnish with fresh cilantro if desired, and serve warm with tortilla chips, veggies, or as a topping for your favorite dishes.