Preheat your oven to 400°F (200°C). Line a baking sheet with parchment paper.
Wash and dry the sweet potatoes, then cut them into 3/4-inch cubes.
In a large bowl, toss the sweet potato cubes with 1 tablespoon olive oil, salt, and black pepper until evenly coated.
Spread the seasoned sweet potatoes in a single layer on the prepared baking sheet, ensuring they have space to roast properly.
Roast for 20-25 minutes, flipping halfway through, until the sweet potatoes are tender and have caramelized edges. Remove from oven and let cool for 5 minutes.
While the sweet potatoes are roasting, prepare the kale by removing the tough stems and chopping the leaves into bite-sized pieces.
Place the kale in a large serving bowl and drizzle with the remaining tablespoon of olive oil and a pinch of salt.
Using your hands, massage the kale for 2-3 minutes until it darkens and becomes softer.
Add the roasted sweet potatoes to the massaged kale and drizzle with fresh lemon juice. Toss gently to combine.
Sprinkle with toasted pumpkin seeds and any optional add-ins you desire.
Serve immediately or refrigerate until ready to enjoy.