Preheat oven to 375°F. Mince the garlic and roughly chop the spinach.
In a large bowl, combine the chicken, spinach, feta, yogurt, garlic, and dill.
Lightly oil a 9×13-inch baking dish. Lay 2 sheets of phyllo in the bottom of the dish.
Spread half of the chicken mixture evenly over the phyllo. Top with 2 more sheets of phyllo.
Spread the remaining filling over the phyllo. Top with 2 more sheets of phyllo and brush lightly with olive oil.
Bake for 25–30 minutes, until the top is golden brown and crisp.
Video
Notes
Store leftover casserole in an airtight container in the refrigerator for up to 3–4 days. For best results, reheat portions in the oven at 325°F until warmed through so the phyllo topping stays crisp. You can also microwave individual servings for a quick meal, though the topping will soften slightly.TIPS
Keep the phyllo covered. Phyllo dough dries out quickly, keep the sheets you’re not using covered with a damp towel while you assemble the casserole.
Cover if the top browns too fast. If the phyllo starts to get too dark before the casserole is heated through, loosely cover it with foil for the rest of the baking time.
Let it rest before serving. Give the casserole about 5–10 minutes after baking so it sets up slightly and slices more easily. Short practical tips if needed.