Preheat your oven to 425°F (220°C) to ensure it reaches the perfect temperature for baking.

Wash the sweet potatoes thoroughly under cool water and, if desired, peel them. Slice the sweet potatoes into ¼-inch thick rounds.

In a large mixing bowl, combine olive oil, garlic powder, smoked paprika, cayenne pepper, sea salt, and black pepper. Stir until blended. Add the sweet potato slices, tossing them gently to coat.

Line your baking sheet with parchment paper. Spread the seasoned sweet potato slices in a single layer on the sheet.

Place the baking sheet in the preheated oven and roast for 20-25 minutes, flipping slices halfway through.

Test for tenderness; they should be soft enough to pierce with a fork. Broil for an extra 2-3 minutes if needed.

Remove from oven and sprinkle with fresh rosemary or thyme. Serve warm.