01 -
Get your oven nice and hot at 400°F (200°C, or 180°C fan-forced). Line your largest baking sheet with parchment paper.
02 -
Carefully cut 6 thick slices (about ¾ inch each) from your cauliflowers. Don't worry if some pieces fall apart - you can easily arrange them back together on the baking sheet.
03 -
Sprinkle the Parmesan cheese across your lined baking sheet, then arrange the cauliflower slices on top in a single layer.
04 -
Mix together the oil, sea salt, pepper, and onion powder in a small bowl. Brush this flavorful mixture over your cauliflower steaks.
05 -
Pop them in the oven for 20 minutes, until they're tender when pierced with a fork.
06 -
Top each steak with the grated Gruyere (or cheddar) and return to the oven for 10-15 minutes until the cheese turns golden and bubbly.
07 -
Sprinkle with fresh chives and serve while hot and cheesy.