01 - In a medium saucepan over medium heat, combine the whole milk and softened cream cheese. Stir continuously until the cream cheese has fully melted and the mixture is completely smooth with no remaining lumps.
02 - Gradually add the shredded cheddar and Monterey Jack cheeses to the saucepan, stirring constantly to prevent clumping. Continue stirring until all cheese has melted and the dip achieves a velvety, uniform consistency.
03 - Fold in the finely chopped jalapeño, diced tomato, chives or green onions, minced garlic, ground cumin, smoked paprika, salt, and pepper. Stir thoroughly to distribute all ingredients evenly throughout the dip.
04 - Continue cooking for an additional 3 to 5 minutes, stirring frequently to prevent scorching on the bottom, until the dip thickens slightly and all flavors have melded together.
05 - Transfer the finished dip to a warm serving bowl. Serve immediately while hot alongside tortilla chips, crusty bread, pretzels, or an assortment of fresh vegetables for dipping.