INGREDIENTS
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1 1/2 cups all-purpose flour
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2 teaspoons baking powder
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1/2 teaspoon salt
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1 cup greek yogurt
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1 1/3 cups sugar (divided)
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3 eggs
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2 teaspoons grapefruit zest (1 grapefruit)
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1/2 teaspoon pure vanilla extract
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1/2 cup vegetable oil
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1/3 cup freshly squeezed grapefruit juice
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1/2 cup powdered sugar
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1-2 tablespoons freshly squeezed grapefruit juice