Fast, Economical Sweet Pie! Super soft and delicious

Recipe
Egg - 4 pcs
Sugar - 180 gr
A pinch of salt
Vanilla sugar - 1 tsp
Kefir - 150 gr
Vegetable oil - 70 ml
Flour - 240 gr
Baking powder - 1.5 tsp
Jam - 100 gr
Walnut - 120 gr