Preheat oven to 400°.
Place half of the cheese, onion and crawfish in each pie shell.
In a mixing bowl , beat eggs, then add rest of ingredients, mixing until well blended.
Pour half the mixture into each pie shell. Bake for 15 minutes.
Reduce heat to 350° and bake 30-45 minutes, or until tops have browned slightly.
Serve at room temperature.