Preheat your oven to 425°F (220°C). Line a large baking sheet with parchment paper or lightly oil it to prevent sticking.
Wash and dry the sweet potatoes. Peel if you prefer, or leave the skin on for added texture and nutrients. Cut into 1-inch cubes or wedges for even roasting.
In a large bowl, combine olive oil, maple syrup (or honey), kosher salt, black pepper, smoked paprika and cinnamon. Whisk briefly to emulsify.
Add the cut sweet potatoes to the bowl and toss well to coat each piece evenly with the oil and spice mixture.
Spread the potatoes in a single layer on the prepared baking sheet, making sure there’s a little space between pieces so they roast instead of steam.
Roast in the preheated oven for 25–35 minutes, turning once halfway through. Roast until the edges are golden and slightly crisp and the centers are fork-tender.
During the last 5 minutes of roasting, sprinkle the chopped fresh herbs and red pepper flakes (if using) over the potatoes so the herbs toast gently without burning.
Remove the pan from the oven. Toss the roasted sweet potatoes with a squeeze of lemon juice or a splash of apple cider vinegar to brighten the flavors. Adjust salt and pepper to taste.
Serve warm as a side dish, toss into salads, or top with a dollop of Greek yogurt or crumbled feta for a hearty, satisfying bite.