Preheat your oven to 400 degrees f. then line 2 large sheet pans with parchment paper or silicone mats.
Brush the cabbage steaks evenly with oil on all sides and season with a pinch of sea salt and pepper.
Arrange your cabbage slices onto the prepared baking sheets making sure not to overlap.
They need space to crisp up properly!
Sprinkle evenly with parmesan, then roast in the preheated oven for 15-20 minutes, until they are done to your liking. I like mine to be nice and crispy on the edges!