Macaroni pie is a casserole dish based on baked macaroni and cheese. primary ingredients include elbow macaroni, cheese, and milk. although early records from the 1700s suggest this dish was first created in barbados, spread across the americas during the slave-trade era, and eventually made its way back to europe, various variations now exist. for example, some recipes from 19th-century american cuisine include various meats. in scotland, it is typically prepared using a hot water crust pastry, while in other areas the dish may not have any crust.

Source: Wikipedia