Preheat the oven to 375 degrees Fahrenheit.
Peel and chop the sweet potatoes and transfer them to a large baking sheet along with the avocado oil, chili powder, and sea salt.
Use your hands to toss everything together until the sweet potatoes are coated in oil and seasonings. Spread the sweet potatoes in a single layer over the sheet pan so that they bake evenly.
While the sweet potatoes are roasting, heat the black beans in a small saucepan on the stove top until hot. Chop up (or prepare) any additional taco toppings as well.