Step 1: Preheat your oven to 400°F (200°C). Line a large baking sheet with parchment paper for easy cleanup.
Step 2: Remove any loose or damaged outer leaves from the cabbage. Place the cabbage on a sturdy cutting board with the core facing down. Using a large, sharp knife, carefully slice the cabbage into 3/4 to 1-inch thick rounds, ensuring each slice goes through the core to hold it together.
Step 3: Gently arrange the cabbage slices in a single layer on the prepared baking sheet. If necessary, use two baking sheets to avoid overcrowding, which can lead to steaming instead of roasting.
Step 4: Drizzle both sides of each cabbage steak generously with olive oil. Use your hands or a pastry brush to ensure they are well coated.
Step 5: Sprinkle both sides of the cabbage steaks liberally with garlic powder, smoked paprika, salt, and black pepper. Make sure the seasonings are evenly distributed.
Step 6: Place the baking sheet(s) in the preheated oven. Roast for 15-20 minutes, then carefully flip each cabbage steak.
Step 7: Continue roasting for another 10-15 minutes, or until the edges are beautifully browned and caramelized, and the cabbage is tender when pierced with a fork. The exact cooking time may vary depending on your oven and the thickness of your cabbage slices.
Step 8: Remove the roasted cabbage steaks from the oven and let them rest on the baking sheet for a few minutes before serving. Serve hot as a side dish or light main course.