Chocolate Snickerdoodles

Ingredients (15)

• For the cookies:
• 2 1/4 cups all-purpose flour
• 1/2 cup unsweetened cocoa powder
• 1 teaspoon baking soda
• 1 teaspoon cream of tartar
• 1 teaspoon ground cinnamon
• 1/2 teaspoon sea salt
• 1 cup unsalted butter
• 1 cup packed brown sugar
• 1/2 cup granulated sugar
• 2 large eggs
• 1 teaspoon vanilla extract
• Cinnamon sugar mixture:
• 1/4 cup granulated sugar
• 1 1/2 teaspoons ground cinnamon