The main ingredient in French toast is bread. French toast is a popular breakfast dish made by soaking slices of bread in a mixture of beaten eggs and milk, often flavored with vanilla, cinnamon, or nutmeg. After soaking, the bread is fried in butter or oil until golden brown on both sides. While traditional French toast uses various types of bread, including brioche or challah, it can be made with any bread available. French toast is typically served with toppings such as syrup, powdered sugar, fruit, or whipped cream, making it a delicious and versatile meal.