Ingredients:
For the cream
50ml milk
2 tsp vanilla extract (use less if you extract flavor is very strong)
6egg yolks
220g sugar
65g corn starch
2 tbsp butter
For the donuts
250g bread flour 270 g
all-purpose flour (put two tablespoons of it aside for the yeast)
75g sugar
100g butter
20g yeast
7g salt
2 eggs
2 egg yolks
120 ml warm water
1 tsp vanilla extract
For sugar coating
100g sugar
1 tsp cinnamon
Instructions
1. For the vanilla cream
Heat the milk and vanilla sugar in a small pot until it starts to boil. Set aside for 10 minutes.
2. In a bowl mix well egg yolks and sugar. Add corn starch and mix well again.
3. Mix milk in the egg mixture.
4. Put all of it trough strainer back to the pot and put on heat. Start cooking it so it becomes thick. Mix all the time.
5. Set away from the fire and mix in the butter.
Chill.
6. For the donuts
Mix together: warm water (around 40ºC | 104ºF), yeast, tablespoon of sugar and two tablespoons of flour and set to a warm place so yeast can activate.
7. Put all the ingreadients in a bowl and mix with electric mixer (with hooks for dough). It will take around 10 minutes.
8. If the dough is too sticky add flour. After 10 minutes knead it with your hands, put it in a bowl, oil it up, cover with foil and set in a warm place until it rises.
9. Meanwhile prepare your surface where you will put your donuts-to-be and sprinkle it with flour.
10. When the dough rises form 30 g heavy balls and make them smooth. Place them on floured surface and cover with plastic foil. Leave them to rise for 1 hour or even more.
11. Check if the balls have risen well. They should look puffy.
12. Once they have risen, you heat around 3 fingers of oil in a pot and fly them 3 minutes covered on one side and 3 minutes uncovered on the other side. Use very low heat.
13. Place baked donuts on a paper towel and immediately roll them in sugar-cinnamon mixture.
14. Final touches
When they are all fried use scissors or a knife to cut them almost in half.
Put the cream in a piping bag and pipe it generously inside donuts.