Preheat oven to 400 degrees.
Heat oil over medium heat in large stock pot. Add sweet potatoes and saute until beginning to brown and potatoes are softening, 8-10 minutes. Add black beans, kale, chipotle pepper and adobo sauce, lime zest, garlic and salt. Continue to saute, stirring occasionally until kale is wilted, another 3-5 minutes. Remove sweet potato mixture from heat and allow to cool a bit.
Mix together the salsa, sour cream, lime juice and salt.
Scatter the crumbled goat cheese over the top of the sweet potato mixture and stir well to combine.
Evenly divide mixture among the eight tortillas (about 1/3 c. each) and roll up tightly.
Place the 8 enchiladas, seam side down, in a greased 9x13 baking dish. Pour the salsa and sour cream mixture evenly over the top of the enchiladas.
Cover the baking dish with foil and bake for 20 minutes. Remove foil and continue baking for another 10 minutes. Turn broiler on high and finish under broiler for another 2 minutes or so, to brown the tops of the enchiladas