Cut the onions and ham into small pieces. Briefly sauté both without fat in a non-stick pan and remove from the heat. Peel the raw potatoes and grate with the parmesan. Mix with the flour, baking powder, eggs, milk and the onion mix.
Preheat oven to 180 degrees.
Chop the chives and mix with the oregano into the batter. Season with salt and pepper. Divide the batter into twelve muffin cases. Finely grate the Gouda cheese and sprinkle over it. Bake for about 30 minutes.