Roast Sweet Potatoes: Preheat oven to 425°F. Peel and cube the sweet potatoes. Spread on a parchment-lined baking sheet, drizzle with olive oil, and sprinkle with salt and pepper. Toss to coat and roast for 25–30 minutes, flipping halfway, until tender and golden. Let cool.
Mix Dressing: In a small bowl, whisk together yogurt, olive oil, honey, Dijon, vinegar, cinnamon, and salt until smooth. Refrigerate until ready to use.
Assemble Salad: In a large bowl, combine spinach, arugula, roasted sweet potatoes, pecans, cranberries, and goat cheese. Drizzle with dressing to taste and gently toss to combine. Serve immediately.
Notes
Allow sweet potatoes to cool before adding to the salad.