Put the oats and seeds in a blender and grind them to a granulated flour texture. Add the agave and melted coconut oil and blend again.
Grease the tart pan and line it with the mixture, going well into the corners. Bake at 180°C for 8 to 10 minutes or until the ends begin to brown. Cool, fill with vegetable yoghurt and sprinkle with Chia seeds.