1-First step: Prep the scallops and oven Heat your oven to 200°C (400°F). Lightly grease 4 small ramekins, or use one small baking dish if you prefer a family-style version. Pat the scallops dry with paper towels, then check whether they need trimming. Small scallops can stay whole, medium scallops can be sliced in half, and large scallops can be cut into three pieces. This helps them cook evenly and stay tender. If you are using shells, place them on a sturdy tray so they do not wobble.

2-Second step: Cook the mushrooms and eschalot Melt the 30 grams of butter in a skillet over medium heat. Add the diced eschalot and cook for 1 to 2 minutes until it softens. Stir in the diced mushrooms and cook for about 5 minutes, until they release their moisture and begin to brown lightly. This step matters because the mushrooms build the base flavor for the sauce. If you are cooking for someone who prefers a lighter taste, keep the browning gentle.

3-Third step: Make the creamy sauce Sprinkle the plain flour over the mushroom mixture and stir for 1 minute to coat everything. Slowly pour in the hot milk and hot thickened cream, stirring all the time so the sauce stays smooth. Add the salt, black pepper, and a pinch of ground nutmeg. Let the sauce simmer for 2 to 3 minutes until it thickens enough to coat the back of a spoon. If it looks too thick, add a splash more milk. If it seems too thin, give it another minute on the heat.

4-Fourth step: Add the scallops Gently fold the scallops into the sauce and let them cook for about 1 minute, just until they start turning opaque at the edges. You do not want to cook them fully on the stove, because they will finish in the oven. This keeps the scallops tender, which is key for a good scallops recipe. Spoon the mixture into the ramekins or baking dish.

5-Fifth step: Make the topping In a small bowl, mix the panko breadcrumbs with the melted butter, shredded Gruyère, and 0.125 teaspoon cooking salt. Stir until the crumbs are evenly coated and lightly moist. The butter helps the topping brown, while the cheese adds that classic savory crust. If you want a little more color, you can add a tiny extra spoonful of cheese on top.

6-Final step: Bake and serve Sprinkle the breadcrumb mixture evenly over the scallops. Bake for 15 to 20 minutes, or until the top is golden and the sauce is bubbling around the edges. If you are baking one large dish, it may need 20 to 25 minutes. Let it rest for 3 to 5 minutes before serving so the sauce settles a little. Serve warm with salad, crusty bread, or simple vegetables.