Preheat oven to 350°F (175°C).
Roll out the dough on a lightly floured surface to about 1/8-inch thickness.
Cut out circles using a cookie cutter or a glass.
Place a spoonful of jam in the center of each circle.
Fold the dough in half over the jam to form a half-moon shape.
Press the edges together firmly to seal.
Place the pastries on a baking sheet lined with parchment paper.
Sprinkle generously with the streusel topping.
Baking:
Bake for 20-25 minutes, or until golden brown.
Let cool slightly on the baking sheet before transferring to a wire rack to cool completely.
Tips for Perfect Streuseltaler:

Cold butter: Use very cold butter for a flaky dough.
Chill the dough: Chilling the dough helps it hold its shape better.
Don’t overmix: Overmixing the dough can make it tough.
Even baking: Rotate the baking sheet halfway through baking for even browning.
Enjoy your homemade Streuseltaler! You can customize them with different jams, add nuts to the streusel, or even drizzle them with glaze.

Would you like me to find some recipes for different jam fillings or streusel variations?