Add the cauliflower rice to a small saucepan with 2 tablespoons of water. Set over a medium heat. Bring to a gentle simmer and cook for 2-3 minutes or until the rice is tender and cooked through. Drain off all excess water and set aside to steam dry.
Add the cooked cauliflower rice to a food processor. Add the ground almonds, coconut flour, grated Parmesan, grated cheddar, garlic powder, salt, baking soda, and apple cider vinegar. Pulse to combine the mixture. You may adjust the level of seasonings to personal taste.
Crack the egg into the food processor. Blend again until well combined with the other ingredients. You should have a slightly tacky yet shapeable dough. Set the dough aside to firm for 5 minutes, allowing the coconut flour to absorb some of the liquid.
Preheat the oven to 375 degrees Fahrenheit and line a shallow oven tray with baking paper. Scoop the dough mixture out onto the lined oven tray. Divide the dough into 4 even portions. Shape each portion with your hands into a circle or oval shape, roughly 1/2 inch thick.
Transfer to the oven and bake for 15 minutes or until lightly golden all over and cooked through. Set aside to cool just a little and firm up. Serve alongside your preferred Keto main or low carb dip.