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Ingredients

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• 1 1/2 pounds sweet potatoes (about 2 to 3 medium or 2 large)
• 2 cups (250 grams) all-purpose flour
• 1 3/4 teaspoons baking powder
• 1/2 teaspoon baking soda
• 1/2 teaspoon table salt
• 1 teaspoon ground cinnamon
• 1/4 teaspoon (more to taste) ground ginger
• Two pinches (more to taste) ground cloves
• 1/2 cup (1 stick or 115 grams) unsalted butter, at room temperature
• 1 cup (190 grams) packed light brown sugar
• 1/2 teaspoon vanilla extract
• 2 large eggs
• 3 large egg whites
• 3/4 cup granulated sugar
• Pinch of salt
• 1/4 teaspoon cream of tartar (will help stabilize egg whites, don’t worry if you don’t have it)