In a medium skillet, heat olive oil over medium heat. Add onion, garlic, bell pepper, and mushrooms. Cook for 5 minutes, or until vegetables are softened.
Add white wine, parsley, basil, oregano, salt, and pepper. Simmer for 2 minutes.
Remove from heat and let cool slightly.
In a bowl, combine bread crumbs, parmesan cheese, and butter. Mix until combined.
Lay sole fillets on a baking sheet. Divide vegetable mixture evenly among fillets. Top with bread crumb mixture.
Bake for 15 minutes, or until fish is cooked through and topping is golden brown.
Interesting Facts
Sole is a type of flatfish found in the North Atlantic and Mediterranean seas.
Stuffed Sole is a popular dish in many European countries.
Stuffed Sole can be made with other types of fish such as cod, flounder, or halibut.