Peel and chop the sweet potatoes into 1" cubes. Chop the apple into 1" cubes as well (you can keep the peel on or off).
Preheat the oven to 425°F. Line a baking sheet with parchment paper.
Using a mixing bowl, mix the cubed potato with 1 tablespoon olive oil and seasalt until everything is evenly coated.
Add the sweet potatoes to the baking sheet and roast on lower rack of oven for 20 minutes.
Add the roasted sweet potatoes back in the large bowl with chopped apples, maple syrup, cinnamon and last 1 tablespoon of olive oil. Toss everything together and spread back on the baking sheet.
Roastanother 20 minutes flipping halfway through with a spatula. Sweet potatoes and apples are done when edges begin to turn golden brown and slightly crispy.