Rinse the chickpeas thoroughly and soak for at least 8 hours.
Rinse the oats and mixed grains well and set aside.
Place the rice, chickpeas, oats, and mixed grains into a pot.
Pour in water (1.2 times the amount of ingredients) and cover with a lid.
Bring to a boil over high heat, then reduce to low heat and cook for 20 minutes.
Turn off the heat and let it steam for 10 minutes.