Saute onions, celery, bell pepper, garlic, and parsley in butter. Cook over low heat for about 30 minutes until soft. Add crawfish tails and cook for 10 minutes. add all seasonings and stir well, cook for 5 minutes. Remove from heat and set aside.
For the cheese sauce
Add flour and butter to a medium-sized pot and cook on medium heat for 5 minutes, stirring well. Then add half and half and continue to cook until it starts to thicken. Add a little extra if the sauce gets too thick. You want a smooth consistency. Add cheese, stir and remove from heat. Set aside.
Heat oven to 350 degrees Fahrenheit.
Combine the crawfish and cheese mixture. Pour into two pre-made pie shells and place them on a cookie sheet.
Bake for 20-25 minutes until the top is starting to brown slightly. Remove from oven and allow to cool for 5-10 minutes to allow the pie to firm. (Cutting straight out of the will still be delicious, but it won't be firm.)
Slice and serve with a salad and french bread.
Notes
Use authentic Louisiana crawfish tails for the best results.
Make these pies ahead of time and freeze them before baking for up to a month. To heat, allow to thaw overnight in the refrigerator and then bake on 350 degrees Fahrenheit for 25 minutes.
*Nutritional information is a calculated guesstimate. Please note that this can change with different brands and modifications you may make to the recipe. For the most accurate information, use a nutritional calculator with the exact brands and measurements you're using with each recipe.