Warm the milk, combine with yeast and let sit until foamy. Whisk in the egg and melted butter, then add flour, sugar, and salt to form a dough.

Knead the dough on a floured surface for 5-7 minutes until smooth and elastic. Place in a greased bowl and cover.

Let the dough rise in a warm area for about 1 hour until doubled in size.

Prepare the filling by mixing pistachio butter, brown sugar, and cinnamon in a bowl.

After rising, roll the dough out into a rectangle, spread the filling, and roll tightly. Slice into rolls.

Place the rolls in a greased baking dish, cover, and let rise for another 30-45 minutes.

Preheat oven to 350°F (175°C) and bake for 23-30 minutes until golden brown.

For the icing, beat together cream cheese, powdered sugar, vanilla extract, and heavy cream until smooth.

Ice the warm rolls and serve with additional chopped pistachios.