01 - If using meat, brown the ground beef or sausage in a skillet over medium heat. 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 in the garlic powder and black pepper, distributing evenly over the ingredients in the crockpot.
04 - Cover and cook on the low heat setting for 2 hours, stirring occasionally, until all cheeses are fully melted and the dip reaches a smooth, creamy consistency.
05 - Keep the crockpot on the warm setting and serve the dip with tortilla chips, crackers, or fresh vegetable sticks for dipping.