Separate eggs. Stir egg yolk, mineral water, milk, flour, baking powder and 1 pinch of salt until smooth. Let the dough swell for about 10 minutes
Clean the mushrooms, wash if necessary and dab dry with kitchen paper. Peel and finely chop the onion. Wash parsley and chop roughly. Beat egg white and 1 pinch of salt until stiff. Fold into the dough
Heat 1 teaspoon of fat in a frying pan (approx. 20 cm Ø). Sauté onions and mushrooms for 2-3 minutes, season. Take out about 2/3 of the mushroom mixture
Spread half the dough over the mushrooms in the pan. Bake at medium heat for 2-3 minutes on each side until golden brown. Keep warm. Heat 1 tsp. fat in the pan. Add 1/3 mushrooms and the rest of the dough and bake as well. Sprinkle with the remaining mushrooms and parsley
The omelette is a good alternative to meat: eggs and chanterelles provide high-quality protein, the flour B vitamins