Add the rest of the ingredients (egg, butter, sugar, flour and vanilla) into the yeast mixture. It’s better if you leave the butter outside the fridge for a couple minutes before using it so it’s not that hard to manage.
knead the dough, if you have a stand mixer it’s gonna be really easy since the dough is really sticky but if you do it by hand it’s gonna be a little harder. If you want to give up I recommend you adding a little bit of oil in your hands so it doesn’t stick that much on your hands. You’re gonna want to knead it for 15- 20 minutes (with a stand mixer) or 25 (without one).
In the same bowl we used to mix all the ingredients, you can wash it or not if you decide to wash it add a little bit of oil on the whole inside surface, place the dough there and cover it with a humid (wet but not so wet kitchen towel) or with plastic kitchen wrap
Allow the dough to rest for 1 to 1:30 h, you should see that the dough has doubled in size. Maybe it needs a little less or a little more! If you can leave it in a warm place to quicken the process.
Punch the dough and cover again. Allow the dough to rest in a warm place again please if you can for 1h.
Extend the dough using a rolling pan at this point you can add about a tablespoon on your working surface or oil. I personally like to extend the dough directly on the parchment paper so I don’t have to move it around and it doesn’t stick anywhere. (About 1.5 cm/ 1/2 inch thick)
Now using a circle cutter or cookie cutter / glass/ round shaped thing/ even a doughnut cutter you’re gonna make a round circle and a smaller one on the middle.
Cover them again and let them sleep for 30 minutes, if they’re in a warm place it’s better again, I’ll never stop saying this because is really important!
Fry them at 350 F (175 C) it’s really important that the oil is not too hot because they would burn on the outside and be raw on the inside
drain the excess of oil with lots of paper towel