Preheat the oven to 180 ° C (top / bottom heat). Mix all dry ingredients in a bowl. Add the syrup and mix well with a spoon.
Cover the baking sheet with baking paper. Use a spoon to put the grains on the baking tray as flat blobs - please leave some space, because they will spread a little.
Bake in the oven for about 13-15 minutes. Let cool down a bit, only then put the tray on a rack to cool down completely.