Place the whole chicken into your slow cooker, breast side down. This allows all the meat to stay juicy and tender as it cooks. Pour in 6 cups of water, making sure the chicken is mostly submerged. Drizzle the olive oil over the top and season generously with salt and pepper. Add the peeled garlic cloves.
Set the slow cooker to low and leave it for 5–6 hours. You don’t need to stir or fuss – just let the slow heat do its thing.
Carefully remove the chicken once it’s cooked through and tender. Place it on a large plate or board, and let it cool slightly before shredding the meat.
Strain the broth through a fine sieve or colander into a large heatproof bowl. Discard the garlic and any bits left behind.
Pour the clear, golden broth into glass jars or containers. Allow it to cool before sealing and refrigerating. It will thicken slightly when chilled – that’s a good sign of a nutrient-rich broth.