Classic Gingerbread Cutouts

INGREDIENTS

• 1/2 cup butter, softened
• 1/2 cup brown sugar
• 2/3 cup molasses
• 2 eggs
• 4 cups all-purpose flour, divided
• 1/2 teaspoon baking soda
• 1/2 teaspoon salt
• 1/2 teaspoon ground allspice
• 1/2 teaspoon ground cloves
• 1/2 teaspoon ground cinnamon
• 1/2 teaspoon ground ginger
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• 1 pound confectioners' sugar
• 1/2 teaspoon cream of tartar
• 3 egg whites