Prepare the Dough:

• In a small bowl, mix warm milk with a pinch of sugar. Sprinkle yeast over the top and let sit for 5 minutes until foamy.
• In a large bowl, whisk together flour, ¼ cup sugar, and salt.
• Add the yeast mixture, melted butter, and egg to the dry ingredients. Mix until a soft dough forms.

Knead the Dough:

• Transfer dough to a floured surface and knead for 5-7 minutes until smooth.
• Place in a greased bowl, cover, and let rise in a warm place for 1 hour until doubled in size.

Shape the Donuts:

• Punch down the dough and roll it out to ½-inch thickness.
• Use a heart-shaped cookie cutter to cut out donuts. Re-roll scraps as needed.
• Place on a parchment-lined baking sheet, cover, and let rise for another 30 minutes.

Fry the Donuts:

• Heat oil to 350°F (175°C) in a deep fryer or heavy-bottomed pot.
• Fry in batches for 1-2 minutes per side until golden brown.
• Remove with a slotted spoon and drain on paper towels.

Coat with Sugar:

• While warm, roll donuts in granulated sugar until evenly coated.
• For filled donuts, allow them to cool slightly before injecting jam or chocolate with a piping bag.