History
Stuffing is broadly defined as an edible mixture—often herbs plus a starch (like bread)—used to fill a cavity or to absorb and carry flavor.
Stuffed dishes have been recorded for centuries across many cuisines. In American holiday cooking, “stuffing” and “dressing” evolved into a bread-based side dish that is sometimes baked separately for convenience and food-safety. Modern variations frequently add sausage, mushrooms, and cheeses for richness.
Stuffed mushrooms (a close cousin)
Stuffed mushrooms became a classic appetizer/side in American entertaining, and Italian-American cooks popularized breadcrumb-and-herb versions that often include sausage and cheese—very much in the same flavor family as this bake.