To make Lemon Garlic Sauce: Heat oil in a medium saucepan over medium-low heat. Add green onions and cook until softened, about 2 minutes. Add broth and garlic; heat. Mix cornstarch with 1 tablespoon water in a small bowl. Add to saucepan and stir gently until sauce thickens. Stir in lemon juice and wine, if desired. Spoon hot sauce over cutlets.