01 - If using ground beef or sausage, cook in a skillet over medium heat until fully browned. Drain any excess fat and set aside.
02 - Add the cooked meat (if using), cubed processed cheese, cubed 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 ingredients in the crockpot.
04 - Cover the crockpot and cook on the low setting for 2 hours, stirring occasionally, until all cheeses are fully melted and the dip is smooth and creamy.
05 - Keep the dip warm in the crockpot on the low or warm setting. Serve with tortilla chips, crackers, or fresh vegetable sticks for dipping.