French Scallops with Cream Sauce

Name: French Scallops with Cream Sauce
Cuisine: European, Mediterranean, French
Ingredients: 12 large sea scallops, cleaned; 1 large shallot, finely minced; 1/2 cup dry white wine; 1/4 cup heavy cream; 1/4 cup unsalted butter; 2 tbsp flour; 1/2 cup fish stock (or chicken stock); 1/4 cup grated Gruyère cheese; 2 tbsp fresh parsley, chopped; 2 tbsp olive oil; Salt and freshly ground black pepper; 1/2 lemon (for squeezing); Breadcrumbs for topping (optional)