Slow-Cooker Five Spice Pork Roast

boneless pork roast (2 to 2-1/2 pound)

Chinese Five Spice Powder

kosher salt and cracked black pepper

peanut (canola, vegetable, or olive oil)

small peeled sweet potatoes (about 1-1/2 lbs, cut into 1-inch chunks)

hot cooked rice

chopped cilantro or parsley

finely chopped green onions