Heat the oven to 425 degrees F. Toss the sweet potatoes with avocado oil, smoked paprika and salt on a large sheet pan and roast for 20 minutes.
Meanwhile, mix the smoked paprika, cumin, garlic powder, chipotle, salt and lemon zest. Pat the salmon dry, rub with olive oil and press the spice mix onto the tops.
Toss the kale with olive oil, garlic and a pinch of salt.
Flip the potatoes and push them to the edges. Add the salmon in the middle and scatter the kale around it.
Roast for 10 to 12 minutes, until the salmon flakes easily and reaches 145 degrees F inside and the kale is crisp at the edges.
Squeeze lemon over everything, sprinkle with parsley and serve.