olive oil not extra virgin ▢1 tablespoon (14 g) unsalted butter ▢1 medium yellow onion diced ▢1 medium carrot peeled and diced ▢1 stalk celery diced ▢3 cloves garlic minced ▢4 cup • low sodium chicken stock ▢2 (650 g) chicken breasts boneless and skinless, about 1.5 lb ▢1 teaspoon salt or to taste ▢¼ teaspoon ground black pepper ▢½ teaspoon dried thyme • heavy cream double cream in the UK ▢½ cup (43 g) shredded parmesan cheese ▢3 tablespoons cornstarch cornflour in the UK, mixed with 2-3 tablespoons of water ▢2 cups fresh baby spinach