INGREDIENTS
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Nonstick vegetable oil spray
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2 cups all-purpose flour
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2 teaspoons baking powder
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3/4 teaspoon kosher salt
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1/4 teaspoon baking soda
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1/2 cup buttermilk
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2 tablespoons finely grated lemon zest
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1 teaspoon vanilla paste or extract
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1/2 cup fresh lemon juice, divided
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1/2 cup (1 stick) unsalted butter, room temperature
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1 3/4 cups sugar, divided
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3 large eggs
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1 lemon, thinly sliced on a mandoline