Put 250 g flour, sugar, 1 pinch of salt, butter in pieces and 3 tablespoons of cold water into a mixing bowl. Knead first with the dough hooks of the mixer, then quickly with your hands to a smooth dough. Shape into a flat ball.
Cover and chill for about 1 hour.
Place paper cups in the recesses of a muffin tray (for 12 cups). Preheat the oven (electric cooker: 175 °C/circulating air: 150 °C/gas: see manufacturer). Roll out the dough onto a little flour until it is about 3 mm thin.
Cut out 12 circles (each approx. 7 cm Ø). Place the pie base in the paper cups, pressing the edges slightly. Knead the rest of the dough briefly, roll out again and cut out 12 circles (approx. 6.5 cm Ø each) for the pie lids.
Cut out 1 small heart (1-2 cm) from each circle.
Spread about 1 level tablespoon each of the cranberries on the pie bases. Place the lid on top. Press lightly on the edge. Bake in the hot oven for about 30 minutes. Take out and let cool down on a cake rack.