Heat the oil in a saucepan and add the brown onion. Sauté for 3 minutes, before adding the red chilli flakes and sautéing it for another minute.
Add the beef mince to the pan and cook for 5 minutes until browned.
Add the kidney beans and diced tomatoes. Season with salt and pepper and simmer with the lid on for 20 minutes, stirring occasionally.
While this is cooking, use a frying pan to cook the cauliflower rice for 5 minutes. Remove from the heat and add to a bowl.
Next, cook the silverbeet for 5 minutes in the same frying pan that the cauliflower rice was in. Once wilted remove from the heat and add to the bowl.
Serve the cooked chilli con carne alongside the cauliflower rice and silverbeet.