01 - Combine warm milk and yeast in a large bowl. Let sit for 5 minutes until foamy.
02 - Add sugar, melted butter, eggs, and salt to the yeast mixture. Mix thoroughly. Gradually incorporate flour until a soft dough forms.
03 - Knead dough on a floured surface for 8–10 minutes until smooth and elastic. Transfer to a greased bowl, cover, and let rise in a warm area for 1 hour until doubled in size.
04 - Mix brown sugar and cinnamon in a small bowl. Toss blueberries with 1 tablespoon flour in a separate bowl to prevent bleeding.
05 - Roll dough into a 16x12 inch rectangle. Spread softened butter evenly, sprinkle with cinnamon-sugar mixture, and distribute floured blueberries.
06 - Roll tightly from the longer side into a log. Slice into 12 equal pieces using a sharp knife or dental floss.
07 - Place rolls in a greased 9x13 inch baking dish. Cover and let rise for 30–45 minutes until puffy.
08 - Preheat oven to 350°F. Bake rolls for 22–25 minutes until golden brown and fully cooked through.
09 - Whisk powdered sugar, milk, and vanilla extract until smooth. Drizzle generously over warm rolls before serving.