01 -
In a bowl, whisk together warm milk, sugar, and yeast. Let sit for 5-10 minutes until foamy. Add melted butter, egg, vanilla, and salt. Gradually mix in the flour until a dough forms. Knead for about 8-10 minutes until smooth and elastic. Cover the dough with a towel and let it rise in a warm place for 1-1.5 hours, until doubled in size.
02 -
In a bowl, toss blueberries with sugar and cornstarch. Set aside.
03 -
Preheat oven to 375°F (190°C). Line a baking sheet with parchment paper. Punch down the dough and divide it into 10-12 equal portions. Flatten each piece into a small disc, place a spoonful of blueberry filling in the center, and seal the edges tightly. Place buns seam-side down on the baking sheet.
04 -
In a bowl, mix flour, sugar, and butter with your fingers until crumbly. Brush the buns with a little milk or egg wash and sprinkle with streusel. Bake for 18-22 minutes until golden brown. Let cool slightly before serving.