01 -
Preheat oven to 425°F (220°C).
02 -
In a large skillet over medium heat, melt butter. Add diced onion and celery, cooking until soft and translucent, about 3 to 4 minutes.
03 -
Stir in flour, cooking and stirring for 1 minute to form a roux.
04 -
Gradually whisk in chicken broth and milk. Continue to cook, stirring frequently, until mixture thickens, approximately 3 to 5 minutes.
05 -
Add cooked chicken, mixed vegetables, garlic powder, and dried thyme if using. Season generously with salt and pepper. Mix thoroughly and remove from heat.
06 -
Roll out pie crust and cut into 4 to 5 inch rounds. Gently press each round into the cups of a standard muffin tin, ensuring dough extends up the sides.
07 -
Spoon the prepared chicken mixture evenly into each pie crust. Add decorative dough shapes or an additional layer of crust if desired.
08 -
Brush the tops of each mini pie with beaten egg for a glossy, golden finish.
09 -
Bake in preheated oven for 15 to 20 minutes or until the crust is deep golden and the filling is bubbling.
10 -
Remove mini pies from oven and allow to cool slightly in the tin before serving warm.