Buttery cookies with Jam

My mom used to make a version of these when I was a kid, hers were a bit fancier in presentation but the taste is still there. These are always a hit with everyone I serve them to.

Ingredients
1 cup butter, softened
2/3 cup white sugar
3 egg yolks
2 1/3 cups of flour
Jelly-I used raspberry this time but you can use any flavor of preserves that you like, you can also do half one flavor half another for variety.

Directions
Preheat oven to 375

In a medium bowl cream together the butter, sugar, and egg yolks. This works best with a hand mixer or stand mixer.

Add in flour a little bit at a time until a soft dough forms.

Refrigerate for 5-10 mins to make a more solid dough easier for forming.

Roll into balls and place 2 inches apart on an un-greased cookie sheet.

Use your finger, spoon or something similar to create a well in the center of the cookie. Fill the hole with desired amount of jelly.

Bake for 8-10 mins until golden brown on the bottom.

Let cool for a few minutes then remove from cookie sheets.