Slow Cooker Pork Loin Roast with Brown Sugar and Sweet Potatoes

1) I cut the brown sugar in half 1/2 cup is a lot for two sweet potatoes. 2) I made this pork rub first: 1 tbsp smoked paprika 2 tsp kosher salt 3/4 tsp black pepper 1 1/2 tsp garlic powder 1 1/2 tsp onion powder 1 tsp dried thyme 1/2 tsp dried rosemary, grind a bit with a mortice & pestle 3/4 tsp mustard powder 1/2 tsp cumin powder 3) I don't like anise that's in the Chinese Five Spice so I used Za'atar instead. Yum!