Prepare the sweet potatoes by washing, peeling, and cutting into approximately 1 inch by 1/2 inch portions or smaller. Spray the bottom and sides of a glass casserole dish. Place the sweet potato portions in the casserole, sprinkle with 1 teaspoon of salt (more or less if you prefer), and 1 teaspoon of pumpkin pie spice. Slice the 1/2 stick butter into about 8 pieces and dot over the potatoes. Pour on the caramel topping. Cover and bake at 350 degrees for 45 minutes. Remove from oven and carefully remove cover, stir to coat all the potatoes with the caramel butter sauce. Place uncovered under the broiler for about 5 minutes.