Polish Babka Cake
Ingredients:
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1 ¼ cups all-purpose flour
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2 teaspoons baking powder
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¾ cup potato starch
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¾ cup unsalted butter, at room temperature
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2 tablespoons unsalted butter, at room temperature
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1 ½ cups confectioners' sugar
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1 teaspoon vanilla sugar
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4 eggs, separated
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3 tablespoons sour cream, or more to taste
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½ lemon, zested and juiced
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1 tablespoon almond extract
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2 tablespoons raisins
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1 ½ tablespoons butter
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3 tablespoons dried bread crumbs