Black Bean and Sweet Potato Tostadas

Ingredients (11)

• 2 large sweet potatoes
• Drizzle of olive oil
• Salt and pepper
• 4 corn tortillas
• 1 can black beans
• 1/2 red onion
• 1/2 cup chopped cilantro
• 1 avocado
• 1 lime
• Shredded cheese
• Salsa or hot sauce