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 excess fat if needed.
02 - Add the diced onion and cook for 2-3 minutes until softened. Stir in the garlic and cook for 30 seconds until fragrant.
03 - Sprinkle in the chili powder, cumin, smoked paprika, salt, and black pepper. Mix to coat the beef and onions evenly.
04 - Add the jalapeños and the canned tomatoes with green chilies with their juice. Stir and let simmer for 2-3 minutes.
05 - Reduce heat to low. Add the cubed processed cheese, shredded pepper jack, and milk. Stir constantly until all the cheese is melted and the mixture is smooth and creamy, about 5-8 minutes.
06 - Stir in the sour cream until fully incorporated. Taste and adjust seasoning as desired.
07 - Transfer queso to a serving bowl or a small slow cooker on warm setting. Garnish with cilantro, green onions, diced tomato, and extra jalapeños if desired. Serve hot with tortilla chips.