Preheat the oven to 350°F (175°C) and lightly grease a medium casserole dish.
Cook the breakfast sausage in a skillet over medium heat, breaking it into small crumbles, until browned and fully cooked. Drain off excess grease.
Add the cubed processed cheese, undrained diced tomatoes with green chiles, cooked sausage, and cubed cream cheese to the casserole dish. Stir gently.
Bake for 20 to 25 minutes, stirring once halfway through, until the cheeses are fully melted and the dip is hot and bubbling.
Stir once more and serve immediately with sturdy tortilla chips or other dippers.