Preheat the oven to 200°C.

Soften the butter in the microwave, until it is soft, but not liquid. Or if your kitchen is warm, leave it on the counter to soften.

Mix the butter with the sugar.

Add the salt, vanilla and the yogurt.

Mix until incorporated and soft.

Add the flour, first a few spoons and mix with the spatula or spoon until the dough can be worked by hand.

Add the rest of the flour and mix just until flour is absorbed.

With the dough, form some balls with the size of a nut, and place them on a cookie sheet, with some space between them.

With the back of a measuring cup or a cup, flatten the cookies, and flour the back of the cup in between.

Bake for 15-20 min until slightly golden on the edges.

Transfer on a cooling rack and leave until completely cooled.

Store in an airtight container.