Preheat oven to 425°F. On a large rimmed baking sheet, toss sweet potatoes and chickpeas with 1 tbsp olive oil, smoked paprika, 1/2 tsp salt and 1/4 tsp pepper; spread in a single layer.
Roast 20-25 minutes, stirring once at the halfway point, until sweet potatoes are fork-tender and chickpeas are lightly crisped.
Meanwhile, whisk the dressing in a small bowl: 3 tbsp olive oil, apple cider vinegar, Dijon, maple syrup and a pinch of salt.
In a large bowl, massage the kale with half the dressing for about 1 minute until softened. Add the roasted sweet potatoes, chickpeas, cranberries and pepitas.
Toss with the remaining dressing, top with feta if using, and serve warm or at room temperature. Leftovers keep up to 3 days; dress just before serving.