Preheat oven to 425 Line two baking sheets with parchment paper.
Place the sweet potatoes on a baking sheet and bake for 45-60 minutes or until tender.
Meanwhile, spread the chickpeas on a kitchen towel, top with another towel and rub the chickpeas until they pop out of their skins. Transfer the dried chickpeas to a baking sheet and toss with olive oil. Bake for 20-22 minutes.
Toss with chili powder, cumin, and fleur de sel and return the baking sheet to the oven with the temperature off and leave the chickpeas in the oven, with the door closed until the pan is cool to touch, about 1 hour.
Finally, before serving, puree the cannellini beans with the lime juice in a food processor. Transfer to a bowl and mash in the avocado. Gently stir in the tomatoes, jalapeno, cumin, salt and pepper to taste.
To serve, split the sweet potatoes in half lengthwise and fluff the insides. Top with a generous dollop of the guacamole and the crispy chickpeas. Garnish with cilantro and serve with lime wedges, if desired.