Prepare the filling. Put the previously peeled and grated vegetables (carrots, onions, cabbage) in a frying pan with a little vegetable oil. Then add water to them. Simmer under a lid over medium heat, stirring occasionally. Bring the vegetables to readiness, add salt and parsley. Mix well.
Make the dough. In a deep bowl, combine eggs, sour cream, mayonnaise, salt and baking powder. Mix until smooth. Gradually add flour. The dough should be thick, like for pancakes.
Form the pie. Put ½ of the dough into a form covered with parchment. Put the filling on top and pour the other half of the dough over it. Bake the pie with mayonnaise in the oven at 175-180 °C for 25-30 minutes.