01 - Cook ground beef in a large skillet over medium heat until browned, approximately 5 minutes. Drain excess fat if necessary.
02 - Add onion, garlic, and jalapeño to the skillet. Sauté until softened, about 3 minutes.
03 - Stir in chili powder, cumin, smoked paprika, salt, and black pepper. Cook for 1 minute until fragrant. Remove from heat and set aside.
04 - Combine processed cheese, milk, and cheddar cheese in a large saucepan over medium-low heat. Stir frequently until melted and smooth.
05 - Add diced tomatoes with green chilies including their juices, plus cayenne pepper to the cheese sauce. Stir well to incorporate.
06 - Fold the cooked beef mixture into the cheese sauce. Simmer gently for 3 to 5 minutes, stirring occasionally, until heated through.
07 - Remove from heat and stir in sour cream until well blended.
08 - Transfer to a serving bowl or slow cooker to maintain temperature. Garnish with cilantro and green onions if desired. Serve hot with tortilla chips.