01 - In a large skillet, over medium-high heat, add the ground beef. Cook, using a spoon to break it apart, until it is fully browned and cooked through, approximately 5 to 6 minutes. Drain any excess fat if necessary.
02 - Add the finely diced yellow onion to the skillet and cook for 2 to 3 minutes until softened. Stir in 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. Mix thoroughly to evenly coat the beef and onions.
04 - Introduce the chopped jalapeños and the undrained can of diced tomatoes with green chilies. Stir well and allow the mixture to simmer for 2 to 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 and the queso is smooth and creamy, which typically takes 5 to 8 minutes.
06 - Stir in the sour cream until it is fully incorporated into the queso. Taste and adjust the seasoning as desired.
07 - Transfer the finished 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.