How to make
Sift the flour, add the salt to it. Dissolve the yeast in the cool milk, sugar and 2 tbsp flour. Make a well, in it pour in the effervescent yeast, eggs (set aside 1 yolk for smearing), yoghurt and softened butter. Finely grate a little of the feta cheese as well.
Knead a soft, stretchy dough. Roll it out to a circle about 1/2″ (1 cm) thick. Cut out circles using a glass. Prepare the filling of coarsely grated feta cheese and cheese, mixed together with the butter and egg.
In a tray with baking paper, arrange the 1st circle, keep it supported with a glass. Put 1 tbsp of the filling between each of them.
Arrange the circles around the glass in a bagel shape. My tray was larger than I needed, so I filled the space in the middle with part of the filling.
Leave it for 30 min. in a warm area to double in volume. Glaze with the egg yolk and sprinkle with sesame seeds. Bake in a 390°F (200 °C) oven, covered with foil. Once ready and baked, remove the foil to brown it on top as well.
