Step 1

Preheat oven to 400° F and line a large baking sheet with parchment paper.

Step 2

Toss the sweet potatoes with olive oil, chili powder, salt and pepper, and spread onto the baking sheet. Roast for 20 minutes, or until golden brown.

Step 3

Make the avocado yogurt sauce: In a small food processor, combine the yogurt, avocado, garlic, lime juice, and a few generous pinches of salt and pepper. Pulse until smooth. Taste and adjust seasonings. Chill until ready to use.

Step 4

Assemble the tacos with a scoop of the sauce, the roasted sweet potatoes, black beans, and desired toppings. Season with salt, pepper, and squeezes of lime.