We all gave these a perfect 10, how can you go wrong with fried yeast dough and pastry cream ;)? Anyway, here's what to do:
2 1/2 t active dry yeast
2/3 c milk, at room temperature
3 1/2 c flour
1 1/4 c sugar
1 t salt
7 T butter, room temperature, cut into 6-8 pieces
6 T heavy cream
2 c pastry cream
In a stand mixer fitted with the dough hook, combine the yeast and milk. Stir together briefly, then let sit for about 1 minute to dissolve the yeast. Add the flour, 1/4 c of the sugar, the salt and the eggs and mix on low speed for about 1 minute. Then, still on low speed, mix for another 2-3 minutes to develop the dough. Add in the butter, a few pieces at a time, and continue to mix for 5-6 minutes, or until the butter is fully incorporated.
Remove the dough from the bowl, wrap tightly in plastic wrap, and refrigerate for at least 6 hours or up to 15 hours.
Lightly flour a baking sheet. On a well-floured work surface, roll out the dough into a 12 inch square about 1/2 inch thick. Cut out 12 donuts, arrange them on the baking sheet, and cover them with plastic wrap and allow them to rise for 2-3 hours, or until they are doubled in height and feel poufy and pillowy.
Heat 3 inches of oil to about 350 degrees, then in batches, fry the doughnuts for 2-3 minutes on one side, flip, then fry for another 2-3 minutes. Transfer the doughnuts to a paper towel lined plate, and let cool. Toss the donuts into the remaining 1 c sugar, then return it to the tray to cool completely.
Whip the cream until it holds stiff peaks, then fold it into the pastry cream.
When the doughnuts are completely cooled, poke a hole in each one. Fit a pastry bag with a small round tip and fill the bag with the pastry cream mixture. Make sure to squirt the filling all inside the donut, then serve.