Grind the oatmeal into oatmeal in a blender or coffee grinder. Finely grate the pumpkin flesh. Finely grate the Gouda.
Mix the flour with the ground oat flakes and the baking powder. Process all ingredients quickly into a smooth dough.
Divide the dough into 2 pieces. Roll out each piece of dough approx. 1 cm thick into a circle, sprinkle with poppy seeds or sesame seeds as desired and press lightly. Then cut into 12 corners. Place the corners on a baking sheet lined with baking paper. Bake in the preheated oven for approx. 25 minutes at 180 ° C or fan oven 160 ° C.