Combine 2 cups of the all-purpose flour together with the 2 ¼ teaspoon of rapid rise yeast, sugar, and salt into a stand mixer fitted with a dough hook. *
Melt the butter and add it to the water that is heated is to 120°F.
Pour the butter mixture into the flour and combine well.
Add in the egg.
Add 2 cups of flour ONE cup at a time to the mixture.
The dough should be slightly sticky. If the dough is too sticky, add in more flour a little at a time.
Cover and allow the dough to rest for 10 minutes.
Blueberry Filling
Combine the blueberries and granulated sugar together in a saucepan.
Heat on medium-low and allow the berries to release their juices and gently smash the berries.
Stir in 1 teaspoon of lemon juice and cornstarch.
Remove the saucepan from the heat and allow the blueberries to cool.
How to Assemble the Sweet Rolls
Preheat the oven to 350°F
Prepare a 13x9 baking dish by spraying with baking spray and set it aside.
Roll the dough out into a 10x15 rectangle. Sprinkle the rolling surface and a rolling pin with flour is necessary.
Melt 1 tablespoon of butter and spread it onto the rolled dough using a pastry brush.
Spread the cooled blueberry filling onto the dough.
Tightly roll up the dough starting at the long size.
Use a serrated knife or floss to slice the rolls into 1-inch slices.
Place the rolls cut side down into the baking dish.
Cover and allow the dough to rise for 1 hour.
Bake in the preheated oven for 25-30 minutes.
Allow the rolls to cool for at least 15 minutes before icing.
Lemon Sweet Rolls Icing
Zest one lemon and combine it with three tablespoons of lemon juice.
Stir in the confectioner's sugar and the pinch of salt.
Stir until the lumps are removed and drizzle over the cooled rolls.
Notes
* You can make the dough by hand if desired. It will take about 10 minutes of hand kneading to create a springy, slightly sticky dough.