Preheat the oven to 400°F.
Press the tempeh gently with paper towels, then cut it into ½-inch cubes.
In a bowl, toss the tempeh cubes and cooked chickpeas with half a tablespoon of olive oil, minced garlic, a squeeze of lemon juice, salt, and pepper.
Spread the tempeh and chickpea mixture evenly on a baking sheet lined with parchment paper. Roast in the oven for about 20-25 minutes, turning halfway through until they are golden and slightly crispy.
Meanwhile, peel and dice the sweet potato into ½-inch cubes. Toss them lightly with a pinch of salt and a drizzle of olive oil. Spread on another baking sheet and roast for 25-30 minutes, until tender and edges are caramelized.
For the kale, tear the leaves into bite-sized pieces, removing thick stems. Toss the kale with a little bit of salt, a drizzle of olive oil, and a squeeze of lemon juice.
After the sweet potato and tempeh-chickpea mixture are done, combine them with the fresh kale in a large bowl. The residual heat will slightly wilt the kale while keeping it crisp.
Toss everything together, adjust seasonings with additional salt, pepper or lemon juice if needed, and serve immediately.