The makeup of a whole egg includes a good amount of water, as well as protein and fat. These three things work together to perform several functions.
- Binder: Whole eggs work to bind baked goods together because of the protein content and because egg yolks gel as they heat up. This adds structure and strength to baked goods.
- Leavening: Whole eggs contain quite a bit of water. As the water evaporates off the egg in the oven, it helps leaven baked goods.
- Adds Flavor and Color: Whole eggs add flavor, color, and richness.
- Tenderness: The fat in whole eggs adds tenderness and moisture.