
Preheat the oven to 425°F and line a baking sheet with parchment paper.
Remove any loose outer leaves from the cabbage, then slice off the bottom of the core to create a flat base. Stand the cabbage upright and slice into 1-inch-thick steaks. Arrange on the baking sheet.
In a bowl, mix olive oil, garlic powder, and salt. Brush half onto the cabbage steaks, flip, and brush with the remaining oil.
Roast for 30 to 40 minutes until well browned and tender, rotating halfway. Season with salt and pepper.
Serve with lemon wedges.