To a standing mixer, add the flour, yeast, sugar and salt. Mix using a dough hook until combined. Then, add the oil and vanilla extract. Turn the mixer on again and then gradually pour your luke warm milk into the mixer, whilst it is mixing. Keep the dough mixing on a medium speed for 10 minutes.
After the 10 minutes, add your kneaded dough to an oiled bowl, cover (with a towel) and leave for one hour to prove.
Once your dough has proved, take it out onto a clean surface. Divide into 14 pieces and then form the pieces into balls with your hands. Place each circular doughnut onto a small square piece of baking paper. Place them onto a tray and leave them uncovered for a further 40 minutes to prove.
Place your 1 litre of oil into a saucepan on a medium heat. Once it is completely hot, start adding your doughnuts two at a time. Place the doughnut into the oil on the baking paper. After around 2 minutes (once the doughnut is golden brown) flip the doughnuts and fry on the other side. At this point, remove the baking paper carefully. Once golden on both sides, remove the doughnut from the oil and leave to cool.
In a small bowl, place the coffee granules and 2 tablespoon double cream. Mix together until the coffee granules have dissolved. Then, place this coffee cream alongside the remaining double cream into a standing mixer. Mix on a medium speed until peaks begin to form. Then add the vanilla extract and gradually add the icing sugar and continue to beat until firm peaks have formed. Add this to a piping bag.
Get a doughnut and make a hole in the middle of a doughnut, making some space in the centre for the filling. Then, using the piping bag, squeeze some coffee cream into each doughnut. Repeat this process until all doughnuts are filled with coffee cream.
If you want your doughnuts extra sweet, you can coat them in sugar before adding the final topping. You don't need to do this but if you have a sweet tooth you might want to! Then, add your 1 teaspoon yoghurt/ cream to the top of each doughnut before sieving some cocoa powder on top, creating the tiramisu look/ taste. Then, ENJOY! I hope you love them. If you chose to not add sugar to the topping but fancy them slightly sweeter once you start eating them, simply make a little sugar bowl which you can dip the doughnuts in (like churros!)