3. Add the wine to the skillet and bring to a boil. Let it bubble until nearly evaporated. Tip any juices from the plate of scallops into the wine. Turn the heat to low and whisk in the butter. Taste for seasoning and add more salt and pepper, if you like. Transfer the sauce to a small saucepan; keep warm.
4. In the skillet, heat the remaining 1 tablespoon oil. Add the mushrooms and cook over medium-high heat, stirring often, for 3 minutes. Sprinkle with salt and pepper. Add the watercress, salt, and pepper and toss like a salad until the leaves wilt.
5. To serve, place a bed of watercress and mushrooms on each plate, top with scallops, and drizzle with sauce.
Jill Santopietro