Dough:

• 1 cup butter, softened (2 sticks)
• 1 & 1/2 cups granulated sugar
• 2 large eggs
• 1 teaspoon vanilla extract
• 1/2 cup unsweetened cocoa powder
• 2 & 3/4 cups all-purpose flour, spooned and leveled
• 1 & 1/2 teaspoons cream of tartar
• 1 teaspoon baking soda
• 1/2 teaspoon baking powder
• 1/2 teaspoon kosher salt

Rolling Mixture:

• 1/4 to 1/3 cup granulated sugar
• 1 & 1/2 tablespoons cinnamon