1 tablespoons unsalted butter
1 yellow or white onion, chopped
1/2 cup minced fresh parsley
6 sun-dried tomatoes (dry-packed), minced
1/2 pound boneless chicken breast, thinly sliced (optional)
1/4 cup dry white wine
1 recipe bechamel sauce (below)
1 recipe Gnocchi, uncooked, or 1 1/2 pounds store-bought gnocchi, uncooked