Preheat oven to 375 degrees F.
Preheat a cast iron skillet over low-medium heat.
Chop the potatoes and onions.
Add 1 tablespoon of olive oil or butter to the preheated pan.
Add the potatoes and onions. Add salt.
Saute until potatoes start to soften, stirring often.
Add frozen or fresh veggie of your choice and the garlic. Stir well.
Add in the cooked chicken and stir. If you are starting with raw chicken, saute in a separate pan until cooked through before adding to the mixture.
Pour broth and cream or half and half over the mixture.
Add the flour. Stir in and let mixture simmer until it thickens.
Add pepper and stir well. Check for salt and add as needed.
Roll out the pie crust and place over the mixture. Trim the edges.
Make several slits in the crust for venting.
Brush with egg wash (optional).
Bake in preheated oven for 25-30 minutes or until golden brown.