Pre heat oven to 400 F
Add 2 tbsp oil to a large sauté pan and heat over medium heat.
Add onions and sauté until softened, about 10 minutes.
Add remaining 1/4 cup oil, zucchini, eggs, grain free flour, spices and cauliflower to a large mixing bowl.
Mix to combine.
Spray an 8x8 inch pan with oil and pour in batter.
Bake 1 hour and 20 minutes then broil until top is golden about 3-5 minutes.