01 - Combine warm milk and yeast in a large bowl. Let stand for 5 minutes until mixture becomes foamy, indicating yeast activation.
02 - Add sugar, melted butter, eggs, and salt to the yeast mixture. Whisk until well combined. Gradually incorporate flour, mixing until a soft, sticky dough forms.
03 - Turn dough onto a floured surface and knead for 8 to 10 minutes until smooth and elastic. Place in a greased bowl, cover with plastic wrap, and let rise in a warm, draft-free area for 1 hour until doubled in size.
04 - Mix brown sugar and cinnamon in a small bowl. In a separate bowl, toss blueberries with 1 tablespoon flour to prevent bleeding during baking.
05 - Roll dough into a 16x12 inch rectangle. Spread softened butter evenly over surface. Sprinkle with cinnamon-sugar mixture, then distribute floured blueberries. Starting from a long side, roll tightly into a log and slice into 12 equal pieces.
06 - Place rolls in a greased 9x13 inch baking dish. Cover and let rise for 30 to 45 minutes until puffy and noticeably increased in size.
07 - Preheat oven to 350°F. Bake rolls for 22 to 25 minutes until golden brown and cooked through. The center should spring back when lightly touched.
08 - Whisk powdered sugar, milk, and vanilla extract until smooth and drizzling consistency. Drizzle generously over warm rolls immediately before serving.