1. Prepare the Dough:
a. In a bowl, combine the warm milk and sugar. Stir until the sugar is dissolved.
b. Sprinkle the active dry yeast over the milk mixture, let it sit for about 5 minutes until it becomes frothy.
c. In a large mixing bowl, combine the flour and salt.
d. Add the softened butter, eggs, and the yeast mixture to the flour. Mix until a soft dough forms.
e. Knead the dough on a floured surface for about 5-7 minutes until it becomes smooth and elastic.
f. Place the dough in a greased bowl, cover with a damp cloth, and let it rise in a warm place for about 1-2 hours or until doubled in size.
2. Make the Custard Filling:
a. In a saucepan, heat the milk until it’s just about to simmer.
b. In a bowl, whisk together sugar, cornstarch, and egg yolks until well combined.
c. Slowly pour the hot milk into the egg mixture, whisking continuously.
d. Return the mixture to the saucepan and cook over medium heat, stirring constantly until it thickens.
e. Remove from heat, stir in vanilla extract, and let it cool.
3. Shape and Fill the Donuts:
a. Roll out the risen dough on a floured surface to about 1/2-inch thickness.
b. Cut out rounds using a donut cutter or two different-sized round cookie cutters.
c. Place the rounds on a floured surface and let them rise for another 30-45 minutes.
d. Heat vegetable oil in a deep fryer or large, deep skillet to 350°F (175°C).
e. Carefully place the donuts into the hot oil and fry until golden brown on both sides.
f. Remove the donuts and let them cool on a paper towel.
4. Fill the Donuts:
a. Once the donuts are cooled, use a piping bag fitted with a round tip to inject the custard filling into the center of each donut.
5. Finish and Serve:
- Dust the filled donuts with powdered sugar if desired.
- Serve the delicious filled donuts and enjoy!
These filled donuts are a delightful treat, and you can get creative with different fillings such as jam, chocolate ganache, or even a fruity compote. Customize them to your liking and enjoy the deliciousness!