Honey-Lime Sweet Potato, Black Bean and Corn Tacos

lbs sweet potatoes (, peeled if desired and diced into 1/2-inch cubes)

olive oil (, divided)

cumin

paprika

ground coriander

cayenne pepper

Salt and freshly ground black pepper

small yellow onion (, diced (1 cup))

garlic (, minced)

(14.5) oz can black beans, rinsed and drained

frozen yellow corn (, thawed and drained)

honey

fresh lime juice

chopped fresh cilantro

Corn or flour tortillas

Romain lettuce or purple cabbage (, cotija or feta cheese (monterrey or manchengo would also be good), diced avocados, fresh salsa or pico de gallo and hot sauce (optional))