Preheat oven to 425°F. Toss cubed sweet potatoes with olive oil, salt, and pepper. Spread on a baking sheet and roast for 20–25 minutes, flipping halfway, until golden and tender.
Cook the salmon
Season salmon filets with salt and pepper. Roast on a separate sheet pan (or alongside the potatoes if there’s room) for 8–12 minutes, depending on thickness, until just cooked through and flaky.
Massage the kale
Place chopped kale in a large bowl with a drizzle of olive oil and a pinch of salt. Massage with your hands for about 1 minute until the leaves soften and turn a darker green.
Make the vinaigrette
Whisk together olive oil, Dijon, maple syrup, apple cider vinegar, garlic, salt, and pepper until smooth and emulsified.
Assemble the salad
In the large bowl with kale, add roasted sweet potatoes, avocado slices, dried cranberries, and toasted pistachios. Top with salmon. Drizzle with Maple Dijon vinaigrette and toss gently before serving.