Black and White Cookies from It's a Sweet World: Recipes from Around the Globe at Bea’s Bakery by Le

Ingredients

• All-purpose flour—1¾ cups (222 g)
• Baking soda—¼ teaspoon (1 g)
• Baking powder—½ teaspoon (2 g)
• Sweet butter—10 Tablespoons (137 g)
• Table salt—¼ teaspoon (2 g)
• Granulated sugar—1 cup (203 g)
• Whole large egg—1 (45 mL)
• Vanilla extract—2 teaspoons (10 mL)
• Sour cream—⅓ cup (80 mL)
• Sifted confectioners’ sugar—5½ cups (1,068 g)
• Whole milk—7 Tablespoons (105 mL)
• Corn syrup—2 Tablespoons (30 mL)
• Vanilla—1 Tablespoon (15 mL)
• Salt—⅓ teaspoon (6 g)
• Cocoa powder—3 Tablespoons (25 g)