01 -
Preheat oven to 350°F and line cookie sheet with parchment paper.
02 -
Cream butter and sugar until light and fluffy, scraping bowl sides.
03 -
Mix in egg yolk and vanilla until combined.
04 -
Whisk flour and salt, then mix into butter mixture.
05 -
Roll dough into 1-inch balls and place 2 inches apart on sheet.
06 -
Bake for 5 minutes.
07 -
Remove from oven, make thumbprint in center of each cookie.
08 -
Fill each indent with 1/4 to 1/2 teaspoon raspberry jam.
09 -
Return to oven and bake 12-15 minutes more.
10 -
Let cool on wire rack.