Let's Begin!

Dough

• In a large bowl, dissolve yeast and sugar in lukewarm milk, then set aside to bloom and get frothy.
• When the yeast is ready, add the butter, sour cream, eggs, salt, and flour. Then beat until smooth. Add more flour if needed, the dough is normally sticky.
• Turn the dough onto a lightly floured surface, then knead until smooth and elastic.
• Place the dough in a lightly greased bowl, turning once to grease the top of the dough. Cover with plastic wrap and let rise in a warm place until doubled in size.

Filling

• In a large saucepan, combine the sugar, butter, egg, and cinnamon. Cook and stir over medium heat until the mixture is thick enough to coat the back of a spoon.
• Remove from the heat, then gently stir in the walnuts and apple. Cool the mixture completely.

Let's Assemble and bake!

• Punch the dough down, then turn it onto a lightly floured surface. Divide the dough in half, then roll each dough into a 12x10-inch rectangle.
• Spread filling to within a half inch of the edges. Roll up the dough starting with the long side, then pinch the seams to seal.
• Place seam side down on a baking sheet lined with parchment paper, then poke the top with a fork. Cover and let rise until doubled in size. Preheat oven to 350°F.
• Brush the rolls with egg wash, then bake for 30-40 minutes until golden brown.
• Transfer the rolls to a wire rack to cool before cutting.
• Serve warm or at room temperature, and enjoy with family and friends!