Dough: In a small bowl, dissolve the yeast in milk and add a little flour (one teaspoon) and let rise. In a large bowl, beat the oil with the sugar until creamy. Add eggs, salt, yoghurt and the yeast-flour mixture. Stir well and slowly add the rest of the flour. Knead to a doughy consistency, cover and let sit. Filling: In a small bowl, crush cheese with a fork and add the egg yolk, vanilla, honey, lemon zest, half the cinnamon, butter and beat together. Add the sugar while stirring continuously. Roll the dough out thick and cut in circles using a cup. Spread the dough and put a spoonful of filling in the center. Life the edges and pinch to form 8 corners. Place on non stick baking paper and coat with egg yolk and cinnamon.