This is the closest recipe I have ever found to approximate the renowned Saturday kuchens. While the recipe did not come from Grandma, the directions for “daubing” it with sour cream are those she wrote me years ago.
Scald 2 c milk and cool to lukewarm. Melt 1 c margarine. Put milk in large bowl and add 2 tsp sugar and 2 pkg yeast. Stir until blended and add 2 c flour gradually. Let stand 4 minutes till yeast rises. In another bowl, beat 3 eggs until light. Add ¾ c sugar, 2 tsp salt, 1 tsp vanilla, and melted butter, beating each in. Add egg mixture to yeast mix, blending well. Stir in 4-5 c more flour beating till smooth. Dough should be of a consistency easy to handle but not stiff as bread dough. Let rise till double. Divide dough in 3 parts and place in greased 8” or 9” square or round pans. Spread thick sour cream on dough and sprinkle with brown sugar and cinnamon. Let rise till light. Bake 350° for 20-25 minutes or till nicely browned. Immediately upon removing from oven, daub with more sour cream and brown sugar and cinnamon. Or skip second sour cream application, cook and freeze. When needed, defrost and warm in 350° oven and apply sour cream and brown sugar and cinnamon.