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["To prepare dough: use a knife to cut the butter into the flour, then rub it in with your fingertips.", "Add the powdered sugar, baking powder, egg, egg yolk, and sour cream; mix together.", "Knead with your hands until dough is smooth and can be formed into a compact ball.", "Wrap in waxed paper or place in a covered dish and refrigerate for at least 1 hour.", "Preheat oven to 375u00b0F.", "Grease a 12""x15"" cookie sheet with the remaining tablespoon of butter; sprinkle with remaining 2 tablespoons of flour, tipping from side to side to cover completely and evenly.", "Turn the sheet upside down and tap on the bottom to shake off any excess flour.", "On a lightly floured surface, roll dough out to 1/4"" thin and place on buttered cookie sheet, using fingers to spread dough so it completely covers the bottom of the pan.", "Bake for 10 minutes.", "To prepare filling: beat egg whites until stiff.", "Add sugar a few tablespoons at a time, beating constantly.", "Once all of the sugar has been added, beat for 5 more minutes.", "Fold in the chocolate, almonds, and dates.", "Spread over the dough layer.", "Bake at 350u00b0F until pastry is golden brown (20-25 minutes).", "Allow to cool.", "Mix sugar with rum until smooth; drizzle mixture over mazurka.", "With a lightly buttered knife, cut into squares."]
