Preheat the oven to 400 degrees F.
Place the cubed sweet potatoes on a sheet pan. Pour the olive oil evenly over the potatoes. Season with salt and pepper then gently toss to coat. Arrange the potatoes in a single layer and roast until tender, about 25 minutes or so, tossing halfway through.
Add the mixed spring greens and romaine lettuce to a large salad bowl and gently toss.
Place the roasted sweet potatoes, chopped bacon, shredded turkey, apple, pecans, cranberries, and Parmesan cheese evenly over the top of the salad.