Sift the flour, baking powder, salt and sugar together into a bowl.
Cut in the shortening until consistency of meal.
Stir in the milk, eggs and cottage cheese.
Turn out on a floured board and knead lightly.
Roll to desired thickness and cut with a biscuit cutter.
Brush with egg yolk and place on a cookie sheet.
Bake in 425-degree oven for 20 to 25 minutes.