Wash and soak brown rice and black rice thoroughly.
Finely chop carrot, onion, broccoli, and shiitake mushrooms.
Pour the soaked rice and water into a pressure cooker.
Add the prepared vegetables, kidney beans, and nuts.
Add mushroom powder, salt, and olive oil, then mix well.
Press the cook button to start making the rice.
Once done, mix the rice well and serve in a bowl.