Bobby's Lighter Oyster Stew

Drain the oysters in a colander over a bowl, reserving the liquid. Coarsely chop the oysters; set aside. Heat the oil in a large nonstick saucepan over medium heat. Add the leek and scallions and cook, stirring occasionally, until soft, 4-5 minutes. Stir in the flour and cook, stirring constantly with a wooden spoon, 1 minute. Add the broth and milk; bring to a boil. Reduce the heat and simmer, stirring occasionally, until the stew begins to thicken, about 8 minutes. Stir in the oysters, the reserved liquid, parsley, salt and pepper. Cook, just until the oysters begin to curl, 2-3 minutes. Stir in the half-and-half; heat through. Serve with the crackers, if using.