Put the flour, salt, mixed grains and seeds, and the baking powder in a large mixing bowl and mix with a mixer or by hand. Water and apple cider vinegar (if you like) slowly work in by hand and knead until a fairly firm, slightly sticky dough is formed.
Preheat the oven to 170 degrees hot air or 190 degrees circulating air.
Shape the dough into round rolls weighing approx. 90 g and brush them lightly with water. Then cut in a cross shape with a sharp knife and place on a baking sheet lined with baking paper. Bake the rolls for 35 - 40 minutes after the desired browning. Observe the empirical values of your own furnace in terms of time. Every oven bakes differently.
Info: The rolls are very firm and crispy. They taste good for three days afterwards, but then I would toast them briefly.
Recommendation: I would use grains, oatmeal and sunflower seeds for the 300 g.
Tip: The rolls can also be made well on vacation if there is, for example, a meal in the country. B. there are no real rolls.