Discovery of Grains
Between 10,000 BC-4000 BC, a shift took place in food production and consumption. Human civilizations transitioned from hunter gatherers to fixed, agrarian based communities. Grains began to be harvested for food. Boiling grains allowed for easier digestion and access to more nutrition, much like porridge today.
As technology developed, so did the process for preparing grains. Porridge was cooked on stone slabs, making crude flat breads that were less prone to spoilage and more easily transported. These advances in bread making laid the groundwork for Egyptian and Greek innovation.
Here is an excellent video briefly documenting grain consumption in the Neolithic period: