You need 1 ingredient. The key ingredients include: ["Chicken and Mushrooms over Toast", "12 ounces mushrooms (2 cups sliced)(I use portabellas, crimini and, if available, one or two porcini.)", "1 tablespoon olive oil", "1/2 cup white wine, divided", "1 medium yellow onion, coarsely chopped", "1 stalk of celery, diced", "2 tablespoons of butter, divided", "Salt", "1/4 ""white curry"" spice mix (see recipe below) or the spice mixture from Merrill's ""Saag Paneer"" posted on FOOD52, or regular curry powder.", "1 tablespoon flour (I use Wondra)", "1 1/2 cup chopped leftover roast chicken or turkey", "1/2 teaspoon finely chopped fresh rosemary leaves", "1 teaspoon coarsely chopped fresh thyme leaves", "3/4 cup warm chicken stock + more, to taste", "3 tablespoons creme fraiche or sour cream", "2 tablespoons chopped fresh parsley", "Freshly ground pepper to taste", "Toasted slightly stale sandwich bread (or whatever you have on hand)", """White Curry"" Spice Mix", "2 teaspoons cumin seed", "2 teaspoons coriander seeds", "1/4 teaspoon cardamom seeds", "1/2 of a small cinnamon stick", "1 teaspoon yellow mustard seeds", "1/2 teaspoon black peppercorns", "4 whole cloves"].