01 - In a medium saucepan over medium heat, combine milk and heavy cream; bring just to a simmer without boiling.
02 - Add cream cheese, whisking until melted and smooth.
03 - Gradually stir in shredded white American cheese, a handful at a time, whisking constantly until completely melted and dip is smooth.
04 - Stir in diced jalapeño, green chilies, onion, and garlic. Cook for 2-3 minutes, stirring often, until vegetables soften.
05 - Add ground cumin, chili powder, salt, and white pepper. Adjust seasoning as desired.
06 - Reduce heat to low and keep warm until serving, stirring occasionally. If dip thickens too much, whisk in a splash of milk to loosen. Serve with tortilla chips, fresh vegetables, or as a topping for nachos.