Recipe: Black Bean and Sweet Potato Tacos

Name: Recipe: Black Bean and Sweet Potato Tacos
Ingredients: 1 pound sweet potatoes (about 2 medium), peeled and cut into 1/2-inch chunks; 2 tablespoons olive oil, divided; 1 teaspoon kosher salt, divided; 1/4 teaspoon freshly ground black pepper; 1/2 large white or yellow onion, finely chopped; 2 teaspoons chili powder; 1/2 teaspoon ground cumin; 1 (15-ounce) can black beans, drained and rinsed; 1/4 cup water; 1/4 cup chopped fresh cilantro; 12 corn tortillas; Guacamole; Crumbled cotija or feta cheese (optional); Lime wedges