1Preheat your oven to 375°F (190°C).
In a large skillet, melt the butter over medium heat.
Add the chopped onions and cook until they are translucent, about 5 minutes.
Stir in the flour and cook for another 2 minutes, stirring constantly.
Gradually add the chicken broth and milk, stirring continuously until the mixture thickens and becomes smooth.
Add the shredded chicken, chopped spinach, salt, and black pepper to the skillet. Stir well to combine.
Remove the skillet from heat and let the mixture cool slightly.
Roll out the pie crust and place it in a pie dish.
Pour the chicken and spinach mixture into the pie crust.
Cover the pie with another layer of pie crust, sealing the edges and cutting a few slits on top to allow steam to escape.
Bake in the preheated oven for 30-35 minutes, or until the crust is golden brown.
Let the pie cool for a few minutes before serving. Enjoy your Chicken and Spinach Pie!