"Basque Cake baked in 4 1/2 inch springform pans. Before making the cake, you will need to have a cup of basic pastry cream on hand. Alternatively, you can fill the cake with cherry jam or pie filling...."
INGREDIENTS
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1 cup plus 1 tablespoon cake flour (125 grams)
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1/2 teaspoon plus a pinch of baking powder (or eyeball 2/3 of a teaspoon)
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1/4 teaspoon of salt
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2/3 cup unsalted butter, cool room temperature (150 grams) -- butter should be about 62F
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3/4 cup granulated sugar (150 grams)
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1 large egg, room temperature
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1/2 teaspoon vanilla extract
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Lightly beaten egg mixed with a splash of milk for brushing
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2/3 to 1 cup of basic pastry cream, cold