Add the peeled potatoes and chopped cabbage to the slow cooker. Add the chicken boullion cubes, garlic powder and onion powder.
Pour over just enough water to cover the potatoes and most of the cabbage. It is okay if some of the cabbage isn't under water. Don't fill your slow cooker to the tip top, or you risk it overflowing during the cooking time.
Place the lid on the slow cooker. Cook on HIGH for 4.5 hours.
When the cooking time is up, drain the water off the potatoes and cabbage.
Pour over the melted butter, half and half, salt and pepper.
Using a potato masher, mash the potatoes. If needed add a touch more half and half if the potatoes look dry, don't over do it though! After you have mashed the potatoes, add the cooked bacon and green onion.
Stir and serve!
Video
Notes
Can I use kale instead of cabbage?Kale is often used in colcannon potatoes. If you want to use kale in this recipe instead of cabbage you will need to wait to add it. Add 4 cups of chopped kale the last 30 minutes of cooking time. Kale doesn't take long to soften in the slow cooker.Can I use red or gold potatoes?Yes! In fact, if you use red or gold potatoes you do not need to peel them, just cube and add to the slow cooker.