If you have a glass of yogurt at home, make this cookie / very tasty soft cookies

Cup size 200 ml
Ingredients:
1 egg + 1 egg white
1 cup + 1/3 cup sugar
1 cup vegetable oil
1 cup yogurt
5 cups flour
50 g of butter
1 teaspoon soda
1 packet of baking powder
1 packet of vanilla
for the face:
1 egg yolk +1 tablespoon vegetable oil
walnuts
Bake in an oven at 180-200 degrees