Chicken and shiitake pie with red wine and miso

Name: Chicken and shiitake pie with red wine and miso
Ingredients: Pour over crust (can be substituted with any pie crust or pastry of your choice); 1/2 cup flour; 2 eggs; 3 tablespoons olive oil; 1/2 cup regular plain yoghurt; 1/2 teaspoon baking powder; Stuffing; 1 onion, sliced; 3 large leeks, or 4 medium, thinly sliced; 100g bacon, chopped; 2 skinless, boneless chicken breasts, diced into 1cm cubes; 250 grams shiitake mushrooms, sliced thinly; 2 tablespoons light miso; 3 cloves garlic, crushed; 1 teaspoon ground tarragon (blitz your dry tarragon in a spice grinder); 1 tablespoon sugar (omit if using port); 2 tablespoons flour; 1 cup red wine or port; salt and pepper