Prepare the Dough

1. Activate the Yeast: In a small bowl, combine warm milk and sugar. Sprinkle the yeast over the top and let it sit for 5–10 minutes until frothy.
2. Mix the Dry Ingredients: In a large mixing bowl, whisk together the flour and salt.
3. Combine Wet and Dry: Add the yeast mixture, melted butter, and egg to the dry ingredients. Mix until a dough forms.
4. Knead the Dough: Transfer the dough to a floured surface and knead for 8–10 minutes until smooth and elastic. Alternatively, use a stand mixer with a dough hook for 5 minutes.
5. Let the Dough Rise: Place the dough in a lightly greased bowl, cover with a clean kitchen towel, and let it rise in a warm place for about 1 hour, or until doubled in size.

Make the Filling

6. Prepare the Cinnamon Mixture: In a small bowl, mix softened butter, brown sugar, and cinnamon until combined.

Assemble the Rolls

7. Roll Out the Dough: Once risen, punch down the dough and roll it out into a large rectangle, approximately 12×18 inches.
8. Spread the Filling: Evenly spread the cinnamon mixture over the dough, leaving a ½-inch border around the edges.
9. Add Blueberries: Sprinkle the blueberries evenly over the cinnamon mixture.
10. Roll the Dough: Starting from one long edge, tightly roll the dough into a log. Pinch the seam to seal.
11. Cut the Rolls: Using a sharp knife or dental floss, cut the log into 12 equal slices.

Second Rise and Baking

12. Arrange the Rolls: Place the rolls in a greased 9×13-inch baking dish, spacing them slightly apart.
13. Let Them Rise Again: Cover the dish with a kitchen towel and let the rolls rise for 30–40 minutes, or until puffy.
14. Bake: Preheat the oven to 350°F (175°C). Bake the rolls for 22–25 minutes, or until golden brown and cooked through.

Prepare the Glaze

15. Make the Cream Cheese Glaze: In a mixing bowl, beat softened cream cheese and butter until smooth. Gradually add powdered sugar, vanilla extract, and milk, mixing until creamy and spreadable.

Finish and Serve

16. Glaze the Rolls: Spread the cream cheese glaze over the warm rolls, allowing it to melt slightly into the crevices.
17. Serve: Serve warm and enjoy!