Unbelievably Addictive Nut Roll Recipe!

Preheat the oven to 350 degrees F (175 degrees C). Line baking trays with parchment paper.

Mix together warm milk, yeast, and 1 teaspoon sugar in a small bowl. Let stand until yeast softens and begins to form a creamy foam, about 5 minutes.

Mix together 1 cup sugar, 1 cup melted butter, 3 eggs, and salt in a large bowl until well combined. Stir in sour cream. Add flour and yeast mixture; mix and knead until dough comes together. Divide dough into 7 equal pieces.

Stir together remaining 2 cups sugar and 1 1/4 cups melted butter in a second large bowl until sugar is dissolved. Mix in walnuts until coated. Stir in cinnamon and vanilla. Divide filling into 7 equal amounts.

Roll each dough piece into a rectangle, about 1/4-inch thick; brush the tops with some beaten egg whites. Spread an equal amount of filling on top of each rectangle, leaving a border around the edges. Brush borders lightly with egg whites, then roll up each rectangle lengthwise, jelly roll-style. Place each roll, seam-side down, onto the prepared baking trays and brush the tops with egg whites.

Bake in the preheated oven until lightly browned, about 30 minutes. Cool completely before slicing to serve.