Skillet Roasted French Onion Chicken and Potatoes

Ingredients

• 2 tablespoons salted butter
• 1 cup shredded Gruyère cheese
• 2 tablespoons extra virgin olive oil
• 1 tablespoon chopped fresh sage
• 1 cup dry white wine, such as Pinot Grigio or Sauvignon Blanc
• 1/2 teaspoon crushed red pepper flakes, more or less to taste
• 2 large yellow onions, thinly sliced
• 2 pounds skin on, bone in, chicken breasts
• 1 pound mixed baby potatoes, halved if large
• kosher salt and black pepper
• 1 tablespoon worchestire sauce
• 2 tablespoons fresh thyme leaves