01 -
Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper
02 -
In a large bowl, cream the butter and sugar until light and fluffy (about 3 minutes)
03 -
Add the egg yolk and vanilla extract; mix until smooth
04 -
Gradually incorporate the flour on low speed until just combined
05 -
Shape the dough into 1-inch balls and place them on the baking sheet. Make an indentation in each ball using your thumb
06 -
Fill each indentation with about half a teaspoon of raspberry jam
07 -
Bake for 12-15 minutes or until lightly golden around the edges. Cool on wire racks before serving