INGREDIENTS
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FOR THE CAKE
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Vegetable-oil cooking spray
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3/4 cup unbleached all-purpose flour
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1/4 cup whole-wheat flour
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1/2 teaspoon instant yeast, such as RapidRise
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Coarse salt
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2 tablespoons ground flaxseed, plus more for sprinkling (optional)
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2/3 cup plain Greek yogurt, room temperature, drained of excess water
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2 tablespoons unsalted butter, melted
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3 large eggs plus 3 large egg yolks, room temperature
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1 cup plus 2 tablespoons granulated sugar
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1 1/2 teaspoons pure vanilla extract
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1/2 cup raspberries, plus more for garnish
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FOR THE ICING
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2 tablespoons unsalted butter
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1/4 cup whole milk, plus more for thinning
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1/2 teaspoon pure vanilla extract
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Coarse salt
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2 1/2 cups sifted confectioners' sugar
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DIRECTIONS