01 - In a large skillet over medium-high heat, add the ground beef. Cook, breaking it up with a spoon, until browned and cooked through, about 5–6 minutes. Drain any excess fat.
02 - Add the finely diced yellow onion and sauté for 2–3 minutes until softened. Incorporate the minced garlic and cook for an additional 30 seconds until fragrant.
03 - Sprinkle in the chili powder, ground cumin, smoked paprika, salt, and black pepper. Stir thoroughly to evenly coat the beef and onions.
04 - Introduce the seeded and finely chopped jalapeños and the undrained can of diced tomatoes with green chilies. Stir and allow the mixture to simmer gently for 2–3 minutes.
05 - Reduce the heat to low. Add the cubed processed cheese, shredded pepper jack cheese, and whole milk. Stir continuously until all the cheese has melted completely and the mixture achieves a smooth, creamy consistency, which typically takes 5–8 minutes.
06 - Stir in the sour cream until it is fully incorporated into the queso. Taste and adjust seasonings as desired to achieve optimal flavor.
07 - Transfer the prepared queso to a serving bowl or a small slow cooker set to warm. Garnish with chopped fresh cilantro, sliced green onions, diced tomato, and extra jalapeño slices if desired. Serve hot with tortilla chips.