Let’s knead the dough first. To do this, mix flour, salt, baking powder. In another bowl, mix the water and oil, bring to a boil. Pour boiling water into the flour and knead the dough. Transfer to a bag and refrigerate for 15 minutes.
Chop the nuts into medium-sized chips. Combine the nuts with sugar, starch and frozen blueberries.
Roll out the dough into a 1 cm thick circle.
Place the filling in the middle of the dough and close in a circle.
Bake at t = 180 for 25-30 minutes. If possible, so that the dough is ready and the filling does not reach, put the breadcrumbs in the microwave for 1.5 minutes. (I have it sometimes.)