01 - Combine the warm milk and active dry yeast in a small bowl and set aside for 5 minutes until foamy.
02 - In a large bowl, whisk together all-purpose flour, granulated sugar, and fine sea salt. Create a well in the center.
03 - Add eggs, melted butter, vanilla extract, and yeast mixture to the well. Mix thoroughly until a soft dough develops.
04 - Transfer dough to a lightly floured work surface. Knead for 5 to 7 minutes, until smooth and elastic.
05 - Place dough in a greased bowl, cover, and proof in a warm area for 1 hour until doubled in volume.
06 - Punch down dough and roll out to 1/2-inch thickness. Using a 2 1/2-inch round cutter, cut out circles. Arrange on parchment-lined baking sheet.
07 - Cover cut dough and leave to rise for 30 minutes.
08 - Preheat oven to 350°F. Bake for 10 to 12 minutes until lightly golden.
09 - Allow donuts to cool for 5 minutes. Use a piping bag with a narrow tip to fill each with raspberry or strawberry jam.
10 - Dust generously with powdered sugar before serving.