Melt the butter in the baking pan. When melted, add the chicken, shallots, carrots and garlic. Bake this until the chicken is browned and the onion is caramelized.
Add the white wine and the flavored stock, bring it to a boil and let the sauce reduce by a third.
In the meanwhile, you can preheat your oven on 200 degrees Celsius or 392 degrees Fahrenheit. And you can start with the phyllo dough.
Use a brush to divide olive oil on each phyllo sheet. Place the sheets on top of each other. After 3 sheets you can add some almonds chips as well, as a small surprise.
When the sauce is reduced, you can add the cream, spinach and some black pepper. Cook this for another 10 minutes or until the spinach has shrunk. Then add the peas.
Transfer the chicken ragout to an oven dish or Dutch Oven. Then you can add the phyllo dough on top. Use a sharp knife to make a few small cuts in the dough so the steam can escape during the baking proces.