SKILLET GRATIN OF MUSHROOMS AND CHICKEN - Lidia

Ingredients

• 6 medium boneless, skinless chicken breasts (about 6 ounces each)
• All-purpose flour, for dredging
• 1 teaspoon kosher salt
• 4 tablespoons unsalted butter
• 4 tablespoons extra-virgin olive oil
• 12 large shiitake mushrooms, stems removed
• 3 garlic cloves, peeled and crushed
• 6 fresh sage leaves
• ½ cup white wine
• ½ cup prepared tomato sauce
• 6 tablespoons grated Grana Padano