Instructions:

• Step 1: Prepare the Dough

  In a mixing bowl, combine 2 cups of all-purpose flour, granulated sugar, salt, and instant yeast. Whisk these dry ingredients together until well blended.
• Step 2: Combine Wet Ingredients

  In a separate bowl, whisk together the warm milk, 2 tablespoons of melted butter, egg yolks, and vanilla extract until smooth.
• Step 3: Mix Wet and Dry Ingredients

  Pour the wet mixture into the dry ingredients. Stir until the dough begins to come together. Gradually add the remaining 1/2 cup of flour, mixing until the dough is soft and slightly sticky.
• Step 4: Knead the Dough

  Turn the dough onto a lightly floured surface and knead it gently for about 5 minutes until it becomes smooth and elastic.
• Step 5: First Rise

  Place the dough in a greased bowl, cover it with a clean kitchen towel, and let it rise in a warm area for about 1 hour, or until it has doubled in size.
• Step 6: Shape the Donuts

  Preheat your oven to 375°F (190°C). Once the dough has risen, turn it out onto a floured surface and roll it out to about 1/2 inch thickness. Use a donut cutter or two round cutters to cut out the donuts, placing them into a greased donut pan.
• Step 7: Second Rise

  Cover the shaped donuts with a towel and allow them to rise for another 30 minutes.
• Step 8: Bake the Donuts

  Bake the donuts in the preheated oven for 10-12 minutes or until they are lightly golden. Allow them to cool in the pan for a few minutes before transferring them to a wire rack.
• Step 9: Fill the Donuts

  Once the donuts have cooled, use a piping bag or a small spoon to fill each donut with your choice of jelly or jam.
• Step 10: Roll in Sugar

  In a shallow bowl, place the granulated sugar. Roll each filled donut in the sugar to coat it evenly.