Desserts - Chocolate Doughnuts

Sift the flours, cocoa, baking powder, baking soda, salt, and cinnamon together in a large bowl, add the grated chocolate, and set aside. Combine the sugar, buttermilk, butter, eggs, yolks, and vanilla together in a large bowl and whisk until smooth. Add the flour mixture gradually, stirring until the ingredients are just combined. Scrape down the sides of the bowl and cover with plastic wrap. Refrigerate for at least 1 hour or up to 6 hours.

Turn the dough out onto a generously floured work surface. Dust the dough lightly with flour and roll out to about 1/2 inch thick. Cut out doughnuts using a 3-inch doughnut cutter and transfer to a baking sheet. Gather dough scraps, reroll, and repeat cutting doughnuts until all dough is used. Chill doughnuts for 30 minutes.

Heat about 4 inches of vegetable oil in a large deep skillet fitted with a thermometer over medium-high heat until oil reaches 365° F. Fry the doughnuts three at a time for about 1 1/2 to 2 minutes per side. Remove doughnuts with a slotted spoon and drain on a wire rack. Repeat with remaining doughnuts.

Place remaining chocolate in a heat-proof bowl and set aside. Bring cream in small saucepan to a simmer over medium heat. Pour over the chocolate, let sit 30 seconds, and stir until smooth. Top doughnuts with chocolate glaze and sprinkle with nonpareils. Serve immediately.