In a large bowl, whisk together the flour, cocoa powder, sugar, salt, and dry yeast.
Pour the warm milk into the dry ingredients, then add the egg, melted butter, vanilla extract, and Sierra Nevada beer.
Mix the ingredients until combined, then knead the dough for 8-10 minutes until it becomes elastic and smooth.
Cover the dough and let it rise in a warm place for about 1 hour, or until it has doubled in size.
Meanwhile, prepare the chocolate filling: heat the heavy cream until it simmers, then add the chopped dark chocolate. Stir until smooth and let it cool.
On a lightly floured surface, roll out the dough to about 1 cm (approximately 1/2 inch) thickness. Use a glass or doughnut cutter to cut out circles.
Place a small amount of chocolate cream in the center of each dough circle, then fold it in half and seal the edges well to keep the filling inside during frying.
Place the filled doughnuts on a baking sheet lined with parchment paper and cover them with a clean kitchen towel. Let them rise for another 30 minutes.
In a large pot, heat the oil to approximately 340°F (170°C). Test the oil by dropping in one doughnut: if it immediately floats to the surface and bubbles gently, the oil is ready.
Fry the filled doughnuts for 2-3 minutes per side until golden brown. Use a slotted spoon to remove them, then place them on a paper towel-lined plate to absorb the excess oil.
Sprinkle the finished doughnuts with powdered sugar and serve fresh, while the chocolate filling remains soft and creamy.
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