Separate the eggs. Beat the egg whites until stiff. Mix the flour with milk, egg yolk, sweetener and salt to form a smooth dough. Carefully fold in the egg whites. Wash the blueberries and let them drain well.
Brush a pan with butter or oil and heat. Pour in some batter with a ladle and smooth it out. Spread a heaped tablespoon of blueberries on top and bake until golden brown on both sides.
Bake the rest of the batter and berries in the same way. The dough rises nicely and the pancake becomes deliciously fluffy.