Mix egg, flour, 20 g starch, 1/8 l milk and 1 pinch of salt until smooth. Leave to swell for approx. 10 minutes
Clean the leek, wash it and cut it into rings. Steam in 100 ml boiling salted water for about 5 minutes. Drain, catch the vegetable water
Skip the ham. Deglaze with vegetable water and bring to the boil. Stir 1/2 tsp. starch and 5 tbsp. milk until smooth. Thicken sauce with it. Add thyme and simmer for 2-3 minutes. Season to taste
Stir the baking powder into the dough. Heat oil in a coated pan. Add the dough and bake for 1-2 minutes. Sprinkle 2/3 leek over it and continue baking for about 2 minutes. Turn the pancakes over and finish baking. Serve with remaining leek and sauce
If your child also has to eat gluten-free, you can serve the pancake in a sweet way with fresh fruit or compote