Homemade Donuts with Chocolate Filling Ingredients

350 g bread flour
160 ml warm milk (below 36°C)
50 g (5 tablespoons) sugar
6 g (1 tablespoon) instant dry yeast
1 egg at room temperature
6 g (2 teaspoons) salt
40 g unsalted butter at room temperature
Chocolate Filling:

80 g dark chocolate (you can use milk chocolate)
300 ml milk
30 g (3 tablespoons) cornstarch
Coating:

Sugar
Instructions:
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Preparing the dough:

In a small bowl, mix warm milk and yeast, and let it sit for 5 minutes to activate.
In a large bowl, combine the flour, sugar, and salt.
Add the egg and activated yeast to the dry ingredients and knead the dough.
Add the butter and continue kneading until the dough is smooth and elastic.
Cover the bowl with a clean towel and let the dough rise in a warm place for 1-1.5 hours, or until it doubles in size.
Shaping and proofing:

Divide the dough into 10 equal parts and shape them into balls.
Make a hole in the center of each ball and stretch it to form a donut shape.
Place the donuts on a baking sheet, cover them with a towel, and let them proof for 20-30 minutes for the second fermentation.
Repeat the proofing once more to make the donuts fluffier and more airy.
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Preparing the chocolate filling:

Melt the chocolate in a small saucepan over low heat.
In a separate bowl, mix the milk and cornstarch, then add it to the melted chocolate.
Cook the mixture, stirring constantly, until it thickens.
Let the filling cool to room temperature.
Frying the donuts: