Preheat oven to 400 degrees. On a parchment-lined baking sheet, bake sweet potatoes until tender, about 45-60 minutes.

While sweet potatoes are baking, place corn in a medium heavy cast-iron skillet over medium-high heat. Do not add anything else to the pan and do not stir so that the corn gets a little charred. Then toss a little and cook corn until browned and toasted on the outside. Transfer to a medium bowl. Add the black beans to the corn.

You can use the same skillet to sauté the onion and jalapeno. Warm the oil in the skillet and sauté the onion and jalapeno until tender and translucent. Stir in the spices and salt and cook for 1 minute more. Add the cilantro to the pan and turn off the heat. Toss to combine the mixture and transfer to the bowl with the corn and beans.

Remove the sweet potatoes from the oven. Allow to cool slightly so you can cut them easily or use rubber gloves if you’re in a rush and you don’t want to burn your fingers. Slice the sweet potatoes in half lengthwise. Scoop most of the flesh out and leave the skins intact. I like to leave a thin layer of sweet potato to help these stay together better. Transfer the scooped out sweet potato to a large bowl and leave the skins on the parchment-lined baking sheet.

Add avocado to the sweet potato in the bowl and coarsely mash together, but don’t make a puree. Add the corn, bean and onion mixture to the mashed sweet potatoes and stir gently to combine.

Preheat the broiler in your oven and arrange the oven rack to the second level from the top. Scoop the filling into the skins. It might seem like you have too much, but you should use it all and make them nice and full. Sprinkle each with cheese if desired and broil for a couple minutes or until cheese is melted.