01 - If using meat, brown the ground beef or sausage in a skillet over medium heat. Drain any excess fat.
02 - Add the cooked meat (if using), cubed processed cheese, cream cheese, and the entire can of Rotel diced tomatoes with green chilies (including juices) to the slow cooker.
03 - Sprinkle garlic powder and black pepper evenly over the contents of the slow cooker.
04 - Cover the slow cooker and cook on low for 2 hours, stirring occasionally, until the cheeses are fully melted and the dip is smooth and creamy.
05 - Keep the dip warm in the slow cooker and serve with tortilla chips, crackers, or fresh vegetables.