This is the Sausage & Apple Pie from Kate McDermott's Art of the Pie. Recipe available online at this link.
What's not to like - a flaky and delicious cheddar cheese crust, pleasantly spicy sausage (I used the Maple-Sage Breakfast Sausage from The Food Lab) and the herbs and cider cooked into the filling are just perfect with the sweet-tart apples.
I made extra filling and turned them into a few little hand pies: