Sift the flour into a large bowl, then add the powdered sugar and baking powder. This helps to keep the pastry light.
Cut the cold butter into small cubes and add to the flour mixture. Using your fingertips, quickly rub the butter into the flour until the mixture resembles breadcrumbs.
Add the whole egg to the crumbly mixture and quickly knead until a homogenous dough forms. If it's too dry, add a little cold water.
Wrap the dough in plastic wrap and refrigerate for at least 30 minutes to allow the butter to firm up, making the dough easier to handle.
Meanwhile, for the filling, place the cottage cheese in a bowl and add the sour cream, vanilla sugar, honey, grated orange zest, and the freshly squeezed orange juice. Mix everything thoroughly.
In a small bowl, whisk the cornstarch with a little cold water until smooth. Add this mixture to the cottage cheese mixture to ensure a silky smooth filling after baking.
Beat the egg whites until stiff peaks form, then gently fold them into the cottage cheese mixture, making the filling light and airy.
Remove the dough from the refrigerator and roll it out on a lightly floured surface. Place it in a baking pan lined with parchment paper, and evenly spread the cottage cheese filling over it.
Bake in a preheated oven at 350°F (180°C) for 35-40 minutes, or until golden brown. If the top is browning too quickly, loosely cover it with aluminum foil.
Once baked, let it cool completely before slicing and serving. Garnish with fresh orange slices or a dusting of powdered sugar.
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