1 – Preheat the oven to 375°C/Gas Mark 5. Line a baking sheet with parchment paper.
2 – Poke multiple holes into the sweet potatoes using a fork. Bake for 45-60 mins, or until tender.
3 – Meanwhile, heat the olive oil over medium heat in saucepan. Add the garlic and cook for 2mins, until fragrant and before it browns. Add the kale and toss to coat. Add 1/3 cup of water and cover for 5mins. Remove cover, toss the kale again, then reduce the heat and cook for another 15mins, adding more water as needed.
4 – Add the black beans to the kale mixture and cook until warmed through. Season with salt and pepper to taste.
5 – Slice the sweet potatoes in half lengthwise. Top with black beans, kale, and guacamole if desired. Serve.