Preheat oven to 350°F (175°C). Line baking sheets with parchment paper.

Whisk together flour, baking powder, and salt. Set aside.

Beat butter and sugar until light and fluffy, about 2-3 minutes.

Mix in the egg and vanilla extract.

Gradually add dry ingredients to butter mixture until combined.

Scoop tablespoon-sized portions of dough, roll into balls, and place on baking sheets.

Press small wells in dough balls and fill each with 1/2 teaspoon raspberry jam.

Sprinkle with bits of dough crumble over jam.

Bake for 12–14 minutes, until golden around edges.

Sprinkle with sugar while warm, cool for 5 minutes, then transfer to wire rack.