Mix up the chipotle lime dip at least an hour before serving so the spices have a chance to blend together: in a small bowl, mix all the ingredients together and refrigerate.
Preheat the oven to 400 degrees. Cut the sweet potatoes into long sticks and place them in a large Ziploc bag. Add just enough vegetable oil to lightly coat the potatoes, seal the bag and toss to distribute the oil evenly.
Evenly layer the potatoes onto a cookie sheet. Bake for 35 to 45 minutes, turning often until lightly browned. Remove from oven and sprinkle on Kosher salt, to taste.
Serve with the chipotle lime dip.