Preheat your oven to 350°F (175°C). Line a large baking sheet with parchment paper for easy cleanup.
In a medium bowl, whisk together the flour and salt. Set aside.
In a large mixing bowl, beat the softened butter and powdered sugar until light, fluffy, and pale in color (about 2 minutes). Mix in the vanilla extract.
Gradually add the flour mixture to the creamed butter mixture, stirring until a smooth dough forms.
Roll dough into 1-inch balls and place them evenly on the prepared baking sheet.
Use your thumb (or the back of a spoon) to press a small indentation in the center of each dough ball. Fill each well with about 1/2 teaspoon of strawberry jam.
Bake cookies for 12–15 minutes, or until the edges are lightly golden.
Allow cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack. Enjoy warm or at room temperature.
