Preheat the oven to 400°F (200°C) and prepare a baking sheet lined with parchment paper.

Remove the outer leaves from the cabbage and slice it into ¾-inch thick rounds, keeping the core intact.

In a mixing bowl, combine olive oil, garlic powder, smoked paprika, onion powder, thyme, salt, and black pepper, stirring until blended.

Brush the seasoning mixture on both sides of each cabbage steak, ensuring an even coat.

Arrange the seasoned cabbage steaks on the baking sheet in a single layer with space between each piece.

Roast the cabbage steaks in the oven for 25-30 minutes, flipping halfway through.

Remove from the oven and let cool for a minute before serving warm, optionally topped with garnishes.