Jelly Balls

Also called Thumbprints. More so than they are called Jelly Balls. In fact, my mom is the one who called them Jelly Balls. Since it is her recipe, I will call them Jelly Balls as well.

Cream butter and sugar. Then add, in succession, egg yolks, salt and flour. That's it. Then comes the tedious part. Form one-inch balls and flatten them slightly. These cookies don't spread out so I manage to fit 20 on each cookie sheet. Press a thumb into the center of each to create a small crater. Place a small amount of jam (I use raspberry or blackberry) into the crater. Bake for 20 minutes. That's all there is to it. And they are so tasty!

Bon appétit!