Put chia and flax seeds in a little bit of water and let it soak for at least 15 minutes.
Put millet, plant-based milk, salt, vanilla extract, agave nectar and coconut sugar in a pot and bring to a boil. Then cook it on medium heat for 30 minutes.
Add presoaked chia and flax seeds and mix it all together. (If you want, you can also make it without chia and flaxseeds and it will still stick together.)
In a separate bowl mix fruits and a bit of coconut sugar and bring to a boil. Cook for a few minutes, until it becomes completely soft. (If you are using apples, just grate them and mix with cinnamon and lemon juice.)
Put one half of millet mixture in a pan, cover with fruits and then cover with the rest of millet.
Bake on 180°C for around 40 minutes.