Black Bean and Sweet Potato Tostadas

large sweet potatoes, washed, peeled, and cut into small cubes

Drizzle of olive oil

Salt and pepper,

corn tortillas (we used Tortilla Land)

black beans, rinsed and drained

red onion, diced

chopped cilantro

avocado, diced

lime, cut into wedges

Shredded cheese (optional)

Salsa or hot sauce (optional)