Start by cooking the rice according to the packet instructions.
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 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. When the brown rice is cooked, add it to the bowl and stir it through the cauliflower rice.
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.
Add the cooked chilli mixture to the bowl and crumble over the feta to serve.