Catfish With Mushroom and Spinach Stuffing

Name: Catfish With Mushroom and Spinach Stuffing
Ingredients: 2 s catfish fillets (6 oz. ); 2 tablespoons butter; 2 tablespoons olive oil; 2 tablespoons chopped shallots; 8 ounces portabella mushrooms, finely chopped; 2 cups fresh spinach, stems removed, roughly chopped; 2 tablespoons dry white wine; 2 tablespoons flour; 1⁄2 cup heavy cream; 1⁄2 teaspoon fresh lemon juice; 1 pinch cayenne; 2 tablespoons cashews, coarsly chopped; 1⁄8 teaspoon salt, to taste; 1 tablespoon butter, melted; breadcrumbs (optional); fresh lemon wedge