Slow cooker candied sweet potatoes can't get any easier or more delicious. These quite possible could be the most delicious sweet potatoes I've ever tasted.
Combine sweet potatoes, both sugars, salt, butter and vanilla in your slow cooker.
Cover, set to low and cook for 6 hours.
Once potatoes are tender, remove 1/2 cup of the slow cooker liquids. Pour it into a small sauce pan and bring to a boil. This should only take a minute or two. Meanwhile, mix together 2 teaspoons of cornstarch with 2 teaspoons of water.
Once the liquids are boiling, whisk in cornstarch mixture. Continue to whisk until thickened. About 1 minute.
Serve sweet potatoes drizzled with the thickened glaze and top with chopped pecans.