Preheat oven to 350 f.
Grease and line a 9x13 baking dish with avocado oil and a large parchment sheet.
Whisk eggs and all seasonings in a large glass bowl.
Add in the cauliflower and broccoli "rice" to the egg mixture in the bowl, mix well to combine, add cheese if desired - stir - then pour mixture evenly into casserole dish.
Bake for 40-45 minutes or until set and golden on top.