Wash sweet potatoes, but do not dry them.
Place the sweet potatoes in the slow cooker. Cook on high for 4 hours or low for 6 - 8 hours.
Once the sweet potatoes are cooked, remove them from the slow cooker and cut an oval into the top of the sweet potato.
Pull off the top and scoop out the inside of the sweet potato.
Mash the sweet potatoes with a fork or potato masher.
Add butter, honey, and spices and whip ingredients with a mixer.
Spoon the mixture back into the sweet potatoes.
Wrap the sweet potatoes in foil and place in the slow cooker on low or warm until you are ready to serve them.