01 - Combine warm milk and yeast in a large mixing 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. Whisk until well combined. Gradually add flour, stirring continuously until a soft, sticky dough forms.
03 - Turn dough onto a lightly floured surface. Knead for 8 to 10 minutes until smooth and elastic. Transfer to a greased bowl, cover with plastic wrap, and let rise in a warm, draft-free area for 1 hour or until doubled in bulk.
04 - Mix brown sugar and cinnamon in a small bowl until uniform. In a separate bowl, toss blueberries with 1 tablespoon flour to prevent bleeding during baking.
05 - Punch down risen dough and roll into a 16 by 12 inch rectangle on a floured surface. Spread softened butter evenly over dough. Sprinkle cinnamon-sugar mixture across the surface, then distribute floured blueberries.
06 - Starting from one long edge, roll dough tightly into a log. Use a sharp knife or unflavored dental floss to slice into 12 equal pieces, approximately 1¼ inches thick.
07 - Arrange rolls cut-side up in a greased 9 by 13 inch baking dish. Cover with a clean towel 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 a toothpick inserted into the center comes out clean.
09 - While rolls bake, whisk powdered sugar, milk, and vanilla extract in a small bowl until completely smooth and ribbon-like in consistency.
10 - Drizzle warm vanilla glaze generously over rolls immediately after removing from oven. Serve warm for best texture and flavor.