Low Carb Cauliflower Pizza

FRENCH ONION SAUCE
1 Heat olive oil in a cast iron skillet at medium setting. Add sliced onions, stir and cook for few minutes. Lower heat to medium low and cook for about [timer minutes=15]15 minutes[/timer], making sure to stir and check on the onions.
2 Add the seasonings, herbs and continue to cook for about [timer minutes=15]15 minutes[/timer] until onions are golden brown and soft. Stir in the butter/olive oil. Tip: Butter adds the characteristic taste to French onion sauce, but you can choose to include or skip it.
3 You may cook the onions at medium high for a further [timer minutes=5]5 minutes[/timer] to make sure they are caramelized well.
CAULIFLOWER PIZZA CRUST
1 Preheat oven to 450° F.
2 Steam the chopped cauliflower for [timer minutes=10]10 minutes.[/timer] Then, process it until it acquires a fine rice like texture.
3 Place the processed cauliflower in a clean cheese cloth or kitchen towel and squeeze out the moisture as well as you can.
4 The mixture should be very dry. It should be about 1½ cups in quantity.
5 Mix the cauliflower and all other pizza crust ingredients together. Adjust seasoning to your taste.
6 Transfer the cauliflower mixture on to a parchment paper lined baking sheet. Press and shape the mixture into a 8 inch circle that is about 1/4th inch thick.
7 Place the baking sheet in lower rack. Bake for about [timer minutes=20]20 minutes [/timer]until brown. Flip and bake [timer minutes=5]5 to 10 minutes[/timer] on the other side.
ASSEMBLE AND BAKE THE PIZZA
1 Take baked crust from the oven and cool completely. Then carefully spread the onion mixture evenly. 
2 Sprinkle the shredded cheese - Gruyere with Mozzarella. Bake for about [timer minutes=7]7 to 10 minutes[/timer] until the cheese is nicely melted. 
3 You may garnish this low carb cauliflower pizza with chopped basil or parsley.