Preheat oven to 425°F. Line baking sheet with parchment.
Remove damaged outer leaves from cabbage.
Cut cabbage in half through the core.
Cut each half into 1-inch thick slices, keeping core intact.
Lay steaks flat on baking sheet.
Brush both sides with olive oil.
Mix garlic powder, paprika, salt, and pepper.
Sprinkle seasoning on both sides of steaks.
Roast 15 minutes.
Flip carefully with spatula.
Roast 15 more minutes until edges are crispy and center is tender.
Serve hot with optional toppings.