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