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 smooth with no lumps remaining.
02 - Gradually add the shredded cheddar and Monterey Jack cheeses, stirring constantly with a wooden spoon or whisk. Continue stirring until all the cheese has melted completely and the dip reaches a silky, creamy consistency.
03 - Fold in the finely chopped jalapeño, diced tomato, chives or green onions, minced garlic, ground cumin, and smoked paprika. Season with salt and freshly ground black pepper to taste.
04 - Continue cooking for 3 to 5 minutes, stirring frequently to prevent scorching on the bottom, until the dip thickens slightly and all the flavors have melded together.
05 - Transfer the finished dip to a warmed serving bowl. Serve immediately while hot alongside tortilla chips, crusty bread, pretzels, or fresh vegetable sticks such as celery and carrot.