Heat the oven to 350F (180C).
Chop the cauliflower into smaller bits and add into a high-speed blender or food processor.
Pulse until you have cauliflower rice. Alternatively many shops now sell cauliflower rice.
Squeeze any excess water from the cauliflower rice into a paper towel.
Place the cauliflower rice, almond flour, garlic, herbs and eggs in a large bowl, season with salt and pepper. Mix everything until a smooth but moist batter forms.
Place the batter on a baking tray lined with baking paper and flatten it out, leaving the edges a bit thicker.
Bake the crust in the oven for 25-30 mins until the edges start to turn golden brown.
Next, top the crust with the BBQ sauce, chicken, onions and finally cheese. Return to the oven for another 10-15 mins, until the cheese has melted and started browning up.