INGREDIENTS
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1 cup (230g) unsalted butter, softened to room temperature
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1 and 1/4 cups (250g) granulated sugar
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1/2 cup (100g) light brown sugar
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4 large eggs, at room temperature*
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1 Tablespoon vanilla extract
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3 cups (375g) all-purpose flour, careful not to overmeasure*
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1 Tablespoon baking powder
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1/2 teaspoon salt
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1 cup (240ml) buttermilk*
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zest + juice of 3 medium lemons*
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1 and 1/2 cups blueberries, fresh (258g) or non-thawed frozen (275g)
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1 Tablespoon all-purpose flour
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8 ounces (224g) full-fat cream cheese, softened to room temperature
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1/2 cup (115g) unsalted butter, softened to room temperature
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3 and 1/2 cups (420g) confectioners' sugar
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1 - 2 Tablespoons (15-30ml) heavy cream*
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1 teaspoon vanilla extract
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pinch salt