Preheat your oven to 425°F (220°C) and line a large baking sheet with parchment paper or aluminum foil.

Scrub sweet potatoes under cold water, then cut them into 1-inch cubes for even cooking.

In a mixing bowl, toss the cubed sweet potatoes with olive oil, salt, black pepper, and garlic powder until evenly coated.

Melt butter and infuse with herbs if using, then pour over the seasoned sweet potatoes.

Spread sweet potatoes on the baking sheet in a single layer, roast for 25-35 minutes, flipping halfway through.

Let the sweet potatoes sit for 1-2 minutes after roasting, then drizzle with reserved herbed butter before serving.