Preheat the oven to 350F degrees.
Spray or grease a large pie pan or casserole dish.
Slice the head of cauliflower parallel to the base into half-inch steaks. If florets or pieces fall off, you can include them, too!
Layer the cauliflower steaks and the onions in your pie pan or casserole dish.
In a large bowl, beat the eggs with the herbs.
Once fully beaten, pour over the vegetables in the pie pan or casserole dish.
Bake for ~45 minutes or until the eggs have finished cooking and the top is slightly golden.