Fill cooking pot with 8 cups cold tap water. Add the crab meat, corn, and bouillon cube.Place pot on the stove and cover, then turn on heat to high and bring to a boil. As soon as it starts boiling, remove lid and lower heat to medium low and simmer for 15 minutes, stirring occasionally.Add the milk into the pot and stir.Let it simmer for a couple of minutes.Crack eggs into a bowl and beat lightly using a whisk or fork.Drizzle beaten eggs slowly into the pot, allowing it to cook a little, then stir to disperse. Add dissolved cornstarch and cook for about a minute, stirring constantly to prevent lumps.Turn off heat add chopped green onions. Also, add salt and pepper to taste if desired. Stir and allow to sit for a minute or two before serving.Scoop into individual soup bowls and serve hot.