Chicken Parmigiana

INGREDIENTS

• 2 tablespoons butter
• 3/4 cups chicken stock
• 1/4 cup chopped fresh parsley, plus more for serving
• 1/2 cup olive oil
• 1 tablespoon sugar
• Salt and freshly ground black pepper
• 1/2 cup all-purpose flour
• 1 whole medium onion, chopped
• 1 cup freshly grated Parmesan, plus more if needed
• 8 boneless, skinless chicken breasts, trimmed and pounded flat
• 4 cloves garlic, minced
• Basil chiffonade, for serving
• Three 14.5-ounce cans crushed tomatoes
• 1 pound thin linguine