Heat the slow cooker if necessary. Meanwhile, heat the olive oil in a large heavy-based frying pan over a medium heat. Add the chopped onions, carrots and thyme, then gently fry on medium low heat for 15 minutes, stirring occasionally. Tip the vegetables into the slow cooker with the stock. If you’re using a carcass, add it now, breaking it in half if you need to, but don’t go crazy or you will end up with boney soup! Cover and cook for 2 to 3 hours on high until the vegetables are tender.
If you used a carcass, remove it now and shred any remaining chicken off the bones. Stir this back into the soup, or add the ready cooked chicken, plus the peas, then cover and cook for 30 minutes more.
Puree half the soup in the pot with a stick blender and season, to taste.
Mix the yogurt, garlic and lemon juice together, then swirl into the soup in bowls, and serve with crusty bread.
Notes
Freezable – the soup can easily be frozen, but without the garlic and lemon yogurt.
Garlic and lemon yogurt – I’d say this could be optional – I tried it with and without and it’s delicious either way. The yogurt adds a lovely fresh creamy citrus flavour.
Optional variations:
Chicken noodle version - add egg noodles near the end of the cooking time.
Chicken and rice - add rice 30 to 40 minutes before serving.
Lemon and herb - add lemon zest and fresh parsley for brightness.
Add greens - stir kale or spinach in at the end.
Chunkier rustic version - add diced potatoes or pearl barley.
This slow cooker roast chicken soup recipe is easily adapted if you're cooking for less or more people.