Wash the sweet potatoes (you don't need to dry). Then stab 6-8 times per sweet potato with a fork in various spots throughout the sweet potato.
Place the sweet potatoes in the crock pot. Cover and cook on low for 6-7 hours or on high for 3-3.5 hours until a knife can easily be inserted and removed and the sweet potatoes are soft when squeezed gently.
Serve topped with the butter, salt and pepper. Enjoy!
Notes
These are also delicious topped with brown sugar and marshmallows. Yum!