This recipe is almost fifty years old, it was a hit in the seventies and eighties

Prepare the Dough: Activate the yeast in warm milk with sugar. Combine flour and salt in a bowl. Add melted butter, egg, and yeast mixture. Knead until smooth and elastic. Let rise for 1 hour.
Prepare the Cheese Filling: Combine ricotta, feta, parmesan, egg, and parsley (if using) in a bowl. Season with salt and pepper.
Assemble the Rolls: Divide dough into 20-24 pieces. Flatten each piece and fill with cheese mixture. Seal the edges to form balls. Place seam side down in a greased pan.
Second Rise: Let the rolls rise for another 30-45 minutes.
Bake the Rolls: Preheat oven to 375°F (190°C). Brush rolls with melted butter and sprinkle with parmesan cheese. Bake for 20-25 minutes, or until golden brown.
Serve: Let cool slightly and enjoy warm!