In a frying pan over medium heat, fry the leeks in the butter until soft, trying not to brown any of the leeks in the process. You simply want to cook them until they are soft. Add in the garlic, saute until fragrant, around 1-2 minutes.
Place the leeks into a slow cooker then add the potatoes,chicken stock and bay leaves.
Cook on low for 8-10 hours until the potatoes are falling apart and the leeks are soft.
Remove the bay leaves and use an immersion blender to puree until smooth if desired. You can also take a potato masher to the soup to break up the potatoes if you like a chunkier soup.
Stir in the cream until mixed through completely.
Serve and enjoy! Top with green onions or nutmeg if desired.
Nutrition is an automatic estimate and will vary with the brands you use.
Recipe from https://fastandslowcooking.com/slow-cooker-potato-leek-soup/