Step 1

Preheat oven to 400ºF.

Step 2

Toss the sweet potato cubes, onion wedges, olive oil, lime juice, cumin, chili powder, cayenne pepper, and salt in a bowl. Transfer to a rimmed baking sheet and bake for about 25 minutes, or until potatoes are tender, stirring halfway through cooking time.

Step 3

When potatoes are almost done, combine the black beans and salsa in a small saucepan. Cook over medium heat until warmed through.

Step 4

Fill each taco with salsa beans and sweet potatoes, then finish with desired toppings and a squeeze of lime juice.