French Onion Chicken & Rice - Comfort Food with Gruyere - Recipes by Clare

Ingredients

• 3 tablespoons unsalted butter, divided.
• 3 tablespoons extra virgin olive oil, divided.
• 3 pounds sweet onions, halved and thickly sliced.
• 1 tablespoon fresh garlic, minced.
• 1 1/2 teaspoons kosher salt.
• 1/2 teaspoon black pepper, freshly ground.
• 1 teaspoon dried tarragon.
• 1 teaspoon dried thyme.
• 1/3 cup brandy or white wine.
• 1 tablespoon Worcestershire sauce.
• 8 ounces button mushrooms, sliced.
• 1 1/2 cups white rice, uncooked.
• 2 cups fresh baby spinach, packed.
• 3 cups chicken stock.
• 1 cup heavy cream.
• 3-4 cups cooked chicken, torn into pieces.
• 4 ounces Gruyere Swiss cheese, shredded.