In a large pan place olive oil and sweet potatoes. Cover pan and cook over medium heat for 5-7 minutes, stirring occasionally.
Add onions, garlic, salt and pepper. Continue cooking over medium heat for 7-8 until sweet potatoes are cooked through.
In a separate pan over medium heat, add one tablespoon coconut oil and 2-3 tortillas. Heat up tortillas for 1-2 minutes on each side. Remove tortillas and place on a paper towel to remove excess oil. Repeat with remaining tortillas.
For serving, fill each tortilla with 2 tablespoons black beans and equal amounts of the sweet potato/onion mixture. Top with cheese and cilantro and enjoy!