01 - Combine warm milk and yeast in a large bowl. Let stand for 5 minutes until mixture becomes foamy, indicating the yeast is active.
02 - Add sugar, melted butter, eggs, and salt to the yeast mixture. Mix thoroughly to combine. Gradually incorporate flour, mixing until a soft, sticky dough forms.
03 - Turn dough onto a lightly floured surface. Knead for 8 to 10 minutes until smooth and elastic. Place in a greased bowl, cover with plastic wrap or towel, 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 until well combined. In a separate bowl, toss blueberries with 1 tablespoon flour to coat evenly.
05 - Punch down risen dough and roll into a 16x12 inch rectangle. Spread softened butter evenly over the surface, sprinkle with cinnamon-sugar mixture, then distribute floured blueberries across the dough.
06 - Starting from the longer side, roll dough tightly into a log. Using a sharp knife or dental floss, slice the log into 12 equal pieces approximately 1 1/2 inches thick.
07 - Place rolls in a greased 9x13 inch baking dish, leaving space between each. Cover and let rise for 30 to 45 minutes until puffy and nearly doubled.
08 - Preheat oven to 350°F. Bake rolls for 22 to 25 minutes until golden brown on top and cooked through. The center should spring back when lightly touched.
09 - Whisk powdered sugar, milk, and vanilla extract in a small bowl until smooth and creamy. Add additional milk 1 teaspoon at a time if thinner consistency is desired.
10 - Drizzle warm vanilla glaze evenly over the rolls immediately after removing from oven. Serve warm for best texture and flavor.