Preheat the oven to 400°F (200°C) and spread the diced sweet potatoes on a baking sheet. Drizzle with one tablespoon of olive oil and sprinkle with a pinch of salt. Roast for about 25 minutes until they are golden and tender.
While the sweet potatoes are roasting, heat a tablespoon of olive oil in a large skillet over medium heat. Add the sliced apples and cook, stirring occasionally, until they soften and start to caramelize slightly, about 5-7 minutes.
Add the chopped greens to the skillet with the apples and cook until wilted, about 3-4 minutes. If using, sprinkle in cinnamon for added warmth and flavor, stirring to combine.
Once the sweet potatoes are roasted, gently fold them into the skillet mixture. Season with salt and pepper to taste, and cook for another 2-3 minutes to allow flavors to meld.
Remove from heat when the ingredients are heated through and slightly caramelized around the edges. The hash should look colorful, with caramelized pieces and tender vegetables.
Serve the warm autumn sweet potato and apple hash directly from the skillet, garnished with extra greens or a drizzle of olive oil if desired. Enjoy the sweet, savory, and spicy flavors in every bite.