Prepare the Dough

1. Activate the Yeast:
   • Pour 3/4 cup warmed milk (180 ml) into a large mixing bowl.
   • Sprinkle 1.5 tsp active dry yeast (5 g) over the milk and let it sit for about 10 minutes until it becomes frothy.
2. Mix Wet Ingredients:
   • To the yeast mixture, add 3 tbsp fine sugar (45 g), 1 large egg, 1/3 cup melted butter (75 g), 1/2 tsp vanilla essence, and 1/4 tsp salt.
   • Stir until all the ingredients are well combined.
3. Incorporate Flour:
   • Gradually add 3 cups plain flour (375 g) to the wet mixture, stirring with a wooden spoon until a sticky dough forms.

First Proof

4. Knead the Dough:
   • Using oiled hands, gently fold the dough edges into the center repeatedly for a few minutes.
   • Handle the dough gently to maintain its light and airy texture.
5. Let it Rise:
   • Cover the bowl with cling wrap and place it in a warm area.
   • Allow the dough to rise for about 1 hour, or until it has doubled in size.

Shape the Buchteln

6. Prepare for Baking:
   • Line a baking pan with parchment paper and grease it with the extra 2 tbsp melted butter.
   • Preheat your oven to 375°F (190°C).
7. Divide and Shape Dough:
   • Turn the risen dough onto a lightly floured surface.
   • Divide the dough into 12 equal portions.
   • Shape each portion by folding the edges into the center and flattening into a disk with a thicker center.
8. Fill with Jam:
   • Place a spoonful of sweet berry jam in the center of each disk.
   • Bring the edges together and pinch to seal tightly, ensuring the jam does not escape.
9. Final Shaping:
   • Shape each filled bun into a smooth ball, sealing the edges at the bottom.
   • Arrange the buns on the prepared baking pan with a little space between each.

Second Proof and Bake

10. Second Rise:
    • Cover the shaped buns with cling wrap.
    • Let them rise again for about 30 minutes until they become puffy.
11. Add Steam:
    • Place a small, oven-safe dish of water on the bottom rack of the oven. The steam will help create a softer crust on the Buchteln.
12. Bake the Buchteln:
    • Brush the tops of the buns with the remaining melted butter.
    • Bake in the preheated oven for 25 minutes, or until the buns are golden brown.
13. Cool and Serve:
    • Remove the buns from the oven and let them cool for about 10 minutes.
    • Dust with powdered sugar before serving.