Preheat your oven to 400F (200C).
In a medium oven-safe skillet, heat one teaspoon of olive oil over medium heat and sauté the diced onion, carrots, and celery until they begin to soften.
Add the cubed chicken breast to the skillet and cook until the exterior is browned.
In a small bowl, whisk the arrowroot powder into the cold chicken bone broth until smooth, then pour the mixture into the skillet.
Add the dried thyme, sea salt, and black pepper, stirring constantly as the sauce thickens into a glossy gravy.
Remove the skillet from the heat and fold in the frozen peas and Greek yogurt until the sauce is creamy.
In a small dish, mix the almond flour with the remaining teaspoon of olive oil to create a crumbly texture.
Sprinkle the almond flour mixture evenly over the top of the chicken filling.
Place the skillet in the oven and bake for 12 to 15 minutes, or until the topping is golden brown and the filling is bubbling.