Buckeye Cookies — Samantha Chen Bakes

Ingredients

• ½ cup butter, softened (113 g)
• 1 cup granulated sugar (200 g)
• 1 large egg, room temperature
• 1 egg yolk, room temperature
• 2 teaspoons pure vanilla extract
• 1 ½ cups all-purpose flour, spooned and leveled (190 g)
• ½ cup Dutch-processed cocoa powder (40 g)
• ½ teaspoon baking soda