Preheat oven to 425 degrees F.
To a small bowl, add garlic powder, coriander, paprika, sea salt, and black pepper. Stir to combine.
Cut cauliflower from top to bottom into 1" thick slices.
On both sides of each steak, drizzle with olive oil and sprinkle with seasoning mixture.
Bake 15-20 minutes, or until fork tender, turning halfway through the cooking time.