In a large bowl, combine the flour, sugar, salt, and dry yeast.
Add the warm milk, eggs, and vanilla extract, and begin to mix until a dough starts to form.
Melt the butter and gradually add it to the dough while kneading continuously until you have a smooth, elastic dough.
Cover the dough with a kitchen towel and let it rise in a warm place for about 1 hour, or until doubled in size.
Meanwhile, wash the blueberries and mix them with the blueberry jam to create a delicious filling.
On a lightly floured surface, roll out the dough to about 1.5 cm thick. Use a large glass or cookie cutter to cut out circles.
Place a small spoonful of blueberry filling in the center of each dough circle, then place another dough circle on top and press the edges together to seal.
In a deep pot, heat the oil to 350°F (180°C). Test the oil temperature with a small piece of dough – if it immediately rises to the surface and gently fries, the oil is ready.
Fry the filled doughnuts for 2-3 minutes on each side, until golden brown.
Remove the fried doughnuts and place them on a paper towel-lined plate to absorb excess oil. Let them cool slightly.
Generously sprinkle with powdered sugar and serve warm.
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