Begin by preheating a large skillet over medium heat. Add the ground sausage and cook thoroughly, breaking it apart with a utensil until it’s fully browned and no longer pink. Once done, drain off any rendered fat.
In a spacious mixing bowl, whisk together the softened cream cheese, sour cream, Worcestershire sauce, garlic powder, onion powder, cayenne pepper (if desired), and a pinch each of salt and black pepper. Blend until smooth and cohesive.
Fold the cooked sausage into the cream mixture along with the drained Rotel tomatoes, shredded cheddar, and mozzarella. Stir until all components are fully integrated.
Set your oven to 350°F (175°C). Lightly grease an 8x8 or 9x9-inch baking dish. Evenly spread the prepared dip mixture into the dish.
Place uncovered in the oven and bake for 25 to 30 minutes, or until the surface is golden and the dip is visibly bubbling at the edges.
Remove from oven, garnish with freshly chopped parsley or green onions, and serve immediately. Accompany with your choice of tortilla chips, toasted bread slices, or assorted crackers.