Firstly preheat the oven to 350° F or 175° C.
Now take a bowl and add cauliflower.
Then add Marinara Sauce and combine it very well until fully coated.
Now season it with salt and pepper.
Take a baking dish and place half the cauliflower and top it with half of the mozzarella, half of the parmesan and olives.
Lastly, sprinkle with oregano and pepper flakes.
Now add rest of the cauliflower to the baking dish and repeat the topping.
Bake the cauliflower for 30 minutes until it turns tender and cheese is bubbly.
Once it is done, let it cool.
Garnish it with parsley and remaining parmesan and have a slice.