Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.

Carefully remove any outer wilted leaves from the cabbage head and slice it into thick ¾-inch rounds.

In a small bowl, combine the olive oil, garlic powder, smoked paprika, onion powder, thyme, salt, and black pepper. Whisk until well blended.

Generously brush the seasoning mixture onto both sides of each cabbage steak for an even coat.

Arrange the cabbage steaks on the lined baking sheet in a single layer and roast for 25–30 minutes, flipping halfway through.

Once golden and crisp, remove from the oven and serve hot, optionally topping with grated Parmesan cheese or fresh parsley.