In a large bowl, whisk together the flour, sugar, salt, and baking powder.
In a separate bowl, whisk the eggs, then add the milk, vanilla extract, and melted butter.
Gently fold the wet ingredients into the dry ingredients, then carefully fold in the blueberries, being careful not to crush them.
Heat the sunflower oil in a deep skillet or pot to 340-355°F (170-180°C).
Drop small spoonfuls of dough into the hot oil and fry until golden brown, about 3-4 minutes, turning occasionally.
Remove the doughnuts and place them on a paper towel-lined plate to drain excess oil.
Dust the doughnuts with powdered sugar and serve with fresh blueberries for the perfect flavor harmony.
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