Devil's Food Donuts | Saveur

Ingredients

• 3 ¹⁄₄ cups (14 oz.) bread flour, sifted
• ³⁄₄ cup cocoa powder
• 1 tsp. baking powder
• 1 tsp. baking soda
• ³⁄₄ tsp. kosher salt
• ¹⁄₂ tsp. ground cinnamon
• 1 cup sugar
• 4 tbsp. unsalted butter, melted
• 3 oz. bittersweet chocolate, grated
• 2 tsp. vanilla extract
• ³⁄₄ cup buttermilk
• 2 eggs, plus 2 yolks
• Canola oil, for forming and frying
• 3 oz. unsweetened chocolate, grated
• 2 cups confectioners' sugar
• ¹⁄₄ cup heavy cream