Jam filled Butter cookies

1- Mix together butter and powdered sugar until creamy.

2- Then add in the cornstarch, vanilla extract, egg yolks and flour and mix again until your dough forms.

3- Wrap the dough in plastic wrap and put it in the fridge for about 30 minutes to chill.

4- Then roll out the dough about 1/4- inch thick, then cut with a cookie cutter.

5- For the top pieces, cut a circle right in the middle.

6- Place the cookies on a tray lined with parchment paper.

7- Form the scrap pieces into another ball, roll it out again, and repeat until all the dough is done.

8- Place them in the oven at 350° for about 10 to 12 minutes.

9- Take them out of the oven and let the cookies cool down.

10- Sprinkle the cookies with holes with powder sugar and spread cookies without holes with a jam of your choice. Press together jam-filled cookie with holed-out cookies to form a sandwich and enjoy.