Preheat your oven to 375°F (190°C).
Dice the chicken breast into small, bite-sized pieces and set aside.
In a small skillet or saucepan over medium heat, melt 0.5 tbsp of ghee and sauté the diced onion, carrots, and celery until they begin to soften, about 5 minutes.
Sprinkle the arrowroot starch over the vegetables and stir constantly for 1 minute to cook out the raw starch taste.
Slowly pour in the chicken bone broth while whisking or stirring constantly to prevent lumps, allowing the sauce to simmer and thicken into a gravy.
Stir in the diced chicken, frozen peas, sea salt, black pepper, dried thyme, and garlic powder, then remove from heat.
Transfer the chicken mixture into a small oven-safe ramekin or baking dish.
In a tiny bowl, combine the almond flour with the remaining 0.5 tbsp of melted ghee using a fork until a crumbly texture forms.
Sprinkle the almond flour crumble evenly over the top of the chicken filling.
Place the dish in the oven and bake for 15-20 minutes, or until the filling is bubbling and the topping has turned a light golden brown.