Add the walnuts, pecans and sunflower seeds to a food processor and pulse a few times to crumble them up.
In a large pot, add all of the ingredients. Put on low and simmer for a good 20-30 minutes, stirring, until the chia seeds have absorbed most of the liquid. Don't forget to stir as the seeds can stick to your pot at the bottom!
When the oatmeal has thickened, turn off the heat and serve hot. You can also let it cool down and store it in the fridge for your breakfast the next day.
Serve with fresh fruits and any other desired toppings.