Preheat your oven to 400°F (200°C).
Dice the chicken breast into small, uniform half-inch pieces.
In a medium oven-safe skillet or saucepan, melt the ghee over medium heat.
Add the diced onion, carrots, and celery to the skillet, sautéing for 5-6 minutes until the vegetables begin to soften.
Add the chicken pieces and cook until browned on all sides, about 4 minutes.
Sprinkle the arrowroot powder over the chicken and vegetable mixture, stirring constantly for 1 minute to coat.
Slowly pour in the chicken bone broth and coconut milk, stirring continuously to ensure a smooth consistency.
Stir in the frozen peas, sea salt, black pepper, and dried thyme.
Simmer the mixture for 3-5 minutes until the sauce has thickened into a rich, velvety gravy.
If you used a saucepan, transfer the filling into a small individual baking dish; otherwise, leave it in the oven-safe skillet.
Roll out the whole wheat pie crust dough and place it over the top of the filling, crimping the edges to seal and cutting a small slit in the center to allow steam to escape.
Bake for 15-20 minutes, or until the crust is golden brown and the filling is bubbling beneath.
Let the pot pie rest for 5 minutes before serving to allow the sauce to set properly.