Prepare Wet Ingredients: Whisk together 1 cup of lukewarm milk, 1 large egg, and 2 tablespoons of melted butter in a medium bowl until fully blended.

Mix Dry Ingredients: Combine 3 cups of all-purpose flour, 1/4 cup of sugar, and 2 teaspoons of instant yeast in a large mixing bowl.

Combine Ingredients: Gradually pour the wet mixture into the dry ingredients, stirring until a soft, sticky dough forms.

Let Dough Rise: Transfer the dough to a lightly oiled bowl, cover with a towel, and let it rise in a warm area for about 1.5 to 2 hours.

Roll Out the Dough: Turn out the risen dough onto a floured surface and roll it to a thickness of about 1/4 inch.

Cut Donuts: Use a round cutter to punch out donuts from the rolled dough and place them on parchment paper.

Heat Oil: Heat vegetable oil to 170-180°C (340-360°F) in a deep frying pan.

Fry Donuts: Fry each donut for about 2-3 minutes on each side until golden brown and puffed.

Prepare Filling: Whip 1 cup of heavy cream with 2 tablespoons of sugar until stiff peaks form.

Fill Donuts: Cut the donuts partially open, pipe in the whipped cream, and dust with powdered sugar before serving.