Jam Filled Cookies

These cookies are delicious and so easy to make!  The original recipe is found here.  I also made a batch and used peanut butter and chocolate chips instead of jam.

• 3/4 cup butter, softened
• 1/2 cup white sugar
• 2 egg yolks
• 1 3/4 cups all-purpose flour
• 1/2 cup fruit preserves, any flavor  
• 1 tsp. vanilla
• a pinch of salt
• 
  

1. Preheat the oven to 375 degrees F 
2. In a medium bowl, cream together the butter, white sugar and egg yolks. Mix in flour a little bit at a time until a soft dough forms. Roll dough into 1 inch balls. If dough is too soft, refrigerate for 15 to 20 minutes. Place balls 2 inches apart onto ungreased cookie sheets. Use your finger or an instrument of similar size to make a well in the center of each cookie. Fill the hole with 1/2 teaspoon of preserves.
3. Bake for 8 to 10 minutes in the preheated oven, until golden brown on the bottom. Remove from cookie sheets to cool on wire racks.