Then follow our 3 simple steps:
PREHEAT oven to 350°F. Cook pasta as directed on package; drain.
MIX dressing and milk in 2-L casserole dish until well blended. Add pasta, cheese, drained and flaked tuna, seasoning and 1/2 cup each of the special additions. Sprinkle with topping.
BAKE 35 min. or until heated through.