Warm the milk: Heat evaporated milk in a saucepan over low heat until warm but not boiling.
Melt the cheese gradually: Add white American cheese in small batches, stirring constantly until fully melted before adding more.
Season the queso: Stir in garlic powder, onion powder, cayenne, chipotle chili powder (if using), cumin, and salt.
Add Tomatoes and Chilies: Fold in diced green chiles and Rotel tomatoes until evenly distributed.
Finish and adjust: Keep heat low, stir until completely smooth, and adjust thickness with additional milk if needed.
Notes
Storage: Store leftover queso blanco in an airtight container in the refrigerator for up to 4 days. It will thicken as it chills, which is normal.Reheating: Reheat gently over low heat on the stovetop, stirring frequently. Add a splash of evaporated milk or regular milk to loosen the texture and restore creaminess.Cheese choice: White American cheese is essential for a smooth, non-grainy queso blanco. You may blend in a small amount of Monterey Jack for flavor, but keep white American as the primary cheese.Green chiles: Diced green chiles add mild heat and classic restaurant-style flavor. Use mild for less spice or hot for more heat without overpowering the queso.Consistency adjustment: If the queso thickens as it sits, stir in warm milk a tablespoon at a time until it reaches your desired dipping consistency.Variations: Add diced jalapeños for extra heat, swap Rotel with mild tomatoes for a less spicy version, or thin the queso for drizzling over tacos and nachos instead of dipping.