01 -
In a bowl, cream butter and sugar until fluffy. Add egg and vanilla; mix until smooth. Whisk flour, baking powder, and salt in a separate bowl. Gradually blend into the wet ingredients. Form dough into a ball, wrap in plastic, and chill for 30 minutes.
02 -
Beat cream cheese and powdered sugar until creamy. Fold in blueberry jam or homemade purée.
03 -
Roll dough into 1-inch balls. Flatten each and add ½ teaspoon filling in the center. Fold edges over, re-roll gently, and place on a parchment-lined tray. Use a toothpick to swirl the filling into the dough for a marbled effect.
04 -
Preheat oven to 350°F (175°C). Bake cookies for 12–14 minutes until edges are golden. Cool on a wire rack before serving.