Start oven at 400F and use an 8″ square pan. Sift flour, baking powder, salt and 2 Tbsp. sugar together in mixing bowl. Cut in butter with 2 knives or a pastry blender until mixture is coarse. Put an even layer of this crumbly pastry over bottom and halfway up the sides of baking pan. Use your hands and press firmly until it holds. Skin fresh peaches and cut in half. Arrange peaches over bottom pastry neatly and sprinkle with a mixture of remaining sugar and cinnamon.
Bake 15 minutes, then pour a mixture of slightly beaten egg yolks and heavy or sour cream over the top. Bake 15 minutes longer. Serve warm or cold. Makes 6 servings.
I don’t increase the sugar and I use a 13 x 9 inch pan for the kuchen and have increased the recipe to the amounts in parentheses. I also don’t use peach halves but cut the peach in half and then in 1/3 if peach is large or if peach is small and place them in rows. I also use 1 cup of heavy cream and add some half and half to make up the increased amount.