Turn the risen dough onto a lightly floured surface and roll it out into a 14” x 20” rectangle.
Brush 2 tablespoons of very soft butter evenly over the surface, leaving one long edge unbuttered to seal the rolls later. Spread the blueberry jam in a smooth, even layer over the buttered surface, still keeping the same edge clean.
Starting from the long side that has the filling spread to the edge, gently but tightly roll up the dough toward the unbuttered edge. Position the seam side down once rolled.
Using a sharp knife, cut the rolled dough into 12 equal sections. Arrange them in a prepared baking dish, ensuring they are spaced evenly.
Cover with plastic wrap or a damp cloth and let the rolls rise for another 30-45 minutes, until they have doubled in size.
Preheat the oven to 350°F during the final rise.
When the rolls have risen, remove the cover and bake for 22-27 minutes, until they turn golden brown and the center is firm and springs back when touched.
Remove the rolls from the oven and let them cool for 15-20 minutes.