When Wonder Bread hit the market in Indianapolis in 1921, it truly was a wonder: The loaves were larger than the ones Americans were accustomed to, and the revolutionary plastic packaging and addition of preservatives prolonged the bread’s shelf life. In 1930, pre-sliced loaves became available, changing the world of sandwiches forever. Sliced Wonder Bread is also great in this strata; its spongy texture is perfect for soaking up the eggs and milk.