– 2 cups (240g) all-purpose flour – 1/2 cup (100g) granulated sugar – 1/4 cup (50g) firmly packed light brown sugar – 1 teaspoon baking powder – 1 teaspoon ground cinnamon – 1/2 teaspoon baking soda – 1/2 teaspoon salt – 1/2 teaspoon ground ginger – 1/4 teaspoon ground nutmeg – 1/4 teaspoon ground allspice – 1/8 teaspoon ground clove – 3/4 cup (170g) sour cream – 1/2 cup (113g) unsalted butter, melted and cooled – 2 tablespoons milk – 2 large egg – 1 teaspoon vanilla extract – 1 cup (120g) chopped pecan – turbinado sugar, optional