01 -
Set oven to 190°C. Line a baking sheet with parchment paper.
02 -
In a large bowl, beat the butter and brown sugar on high speed using an electric mixer until pale and fluffy.
03 -
Add the egg (or flax mixture) and vanilla extract; beat until thoroughly combined.
04 -
Add the flour and salt to the bowl, mixing until a soft, cohesive dough forms.
05 -
Roll dough into balls approximately 2.5 centimeters in diameter and arrange on the prepared sheet, leaving 4 centimeters between each.
06 -
Gently press a thumb or the rounded side of a teaspoon into each dough ball twice to create a heart-shaped cavity in the center.
07 -
Bake for 12 to 15 minutes, or until cookie edges are lightly golden.
08 -
Let cookies cool on the baking sheet for 5 minutes, then transfer to a wire rack. If the indents have faded, reshape them gently while warm.
09 -
Once completely cool, spoon a small amount of jam into each heart-shaped center.