01 -
Heat your oven to 325°F/165°C and get your baking trays ready with parchment paper.
02 -
Beat the butter, icing sugar, and vanilla together until it’s fluffy and looks pale. An electric mixer works best.
03 -
Toss in the flour, cornstarch, and salt. Mix gently until everything sticks together. It will feel soft.
04 -
Measure about a tablespoon (18g) of dough for each ball, coat them in sugar, flatten into pucks, and press a dent in the center.
05 -
Spoon jam into each dent, but don’t go overboard.
06 -
Cook for 13-14 minutes, just until the edges look set and the jam starts bubbling a bit. Let them cool on the sheet completely.