Preheat oven to 400.
Prepare your sweet potatoes: Peel off the skin, and slice sweet potatoes vertically into thin discs, approximately 1/4 inch (see above picture).
Melt your coconut oil, and brush each side of the sweet potatoes with oil. Sprinkle with cumin and salt.
Bake sweet potatoes for about 20 minutes, or until they are softened, and the edges are dark brown and crispy.
Remove from oven, sprinkle black beans and cheese on top of the sweet potatoes. Place back into oven and bake for another 3-5 minutes, until cheese is bubbly and begins to brown.
Remove from oven, top with remaining ingredients (avocado or guacamole last).
Serve hot!