Crumble the yeast and use a food processor or a mixer with a dough hook to process all of the ingredients into an even dough. Knead the finished dough well on a sufficiently floured work surface and shape into a loaf. Brush the top with a little water. Mix the flax seeds, sunflower seeds and oat flakes on a large plate and roll the loaf in it.
Place the bread on a baking sheet lined with baking paper on the middle rack in the cold oven and let it rest for about 5-10 minutes.
Put a fireproof glass or cup with water in the oven and set it to 200 ° C top / bottom heat and bake the bread for an hour.