Activate the Yeast:
In a large mixing bowl, combine warm milk, sugar, and yeast. Let sit for 5–10 minutes until foamy.

Make the Dough:
Stir in melted butter, eggs, and salt. Gradually add flour, mixing until a soft dough forms. Knead for 6–8 minutes until smooth and elastic.

First Rise:
Place dough in a greased bowl, cover, and let rise for about 1 hour, or until doubled in size.

Prepare Filling:
In a small bowl, mix softened butter, garlic, herbs, Parmesan, salt, and pepper until combined.

Shape the Bread:
Roll dough into a 10×15-inch rectangle. Spread the garlic herb butter evenly, then sprinkle mozzarella over top. Roll tightly from the long side into a log.

Create the Swirl:
Slice the log lengthwise and twist the two halves together with cut sides up. Place in a greased loaf pan.

Second Rise:
Cover and let rest for 20–30 minutes while preheating the oven to 350°F (175°C).

Bake:
Brush the loaf with egg wash and bake for 35–40 minutes, until golden brown. Tent with foil if it browns too quickly.

Cool & Serve:
Let cool for 10–15 minutes before slicing. Serve warm with extra butter or dipping sauce.