Eggs are an ingredient in nearly every meatloaf, and they have two distinct roles. Egg yolks, which are mostly water but contain a good amount of protein and fat, add flavor, richness, and moisture. They also help bind the meat together and get the loaf to set in a stable form without the need to overwork the meat.

Two large eggs: If your recipe requires two large eggs, you can substitute two eggs of either medium, extra-large or jumbo size. The only amount adjustment necessary is if you have small eggs instead, in which case, you should use three.