In a large bowl, combine the flour, yeast, sugar, and a pinch of salt.

In a separate bowl, whisk together the warm milk, melted butter, eggs, and vanilla extract.

Gradually add the wet mixture to the dry ingredients, stirring until a dough forms.

Knead the dough on a lightly floured surface for 5-10 minutes until smooth and elastic.

Place dough in a greased bowl, cover with a towel, and let rise in a warm spot for 1-2 hours until doubled in size.

Punch down the dough and roll out to about ½ inch thick; cut into circles and let rest for 30 minutes.

Heat oil to 350-375°F. Fry dough rounds for 2-3 minutes per side until golden brown.

Let fried Bomboloni cool slightly, then fill with pastry cream using a piping bag.

Dust with powdered sugar before serving warm.