1. Dissolve the yeast and sugar in warm milk in a large bowl. Let sit for 5 minutes or until frothy.

2. Add the flour, cardamom, and baking powder, mixing until combined.

3. Stir in the softened butter and salt, then mix until smooth.

4. Knead the dough by hand or with a dough hook for 10 minutes until smooth and elastic.

5. Place the dough in a lightly greased bowl, cover with a damp cloth, and let rise in a warm place for 1 hour or until doubled in size.

6. Preheat the oven to 190°C (375°F).

7. Punch down the risen dough and divide into 18 equal portions. Roll each into a ball, then gently flatten into an oval shape.

8. Arrange the buns on a parchment-lined baking sheet, leaving 2.5 cm (1 inch) between each.

9. Bake for 15 to 20 minutes, or until golden brown.

10. Cool completely on a wire rack.

11. Once cooled, slice each bun horizontally, fill with a generous spoonful of vanilla cream, and press the top back on. Serve immediately.