In the bowl of a stand mixer fitted with a dough hook (you can also use a large bowl and mix by hand), combine 2 cups of the flour, the salt, cinnamon and yeast. Add the milk mixture and mix until smooth. Add the eggs one at a time, mixing after each.

Add the remaining flour a few tablespoons at a time, letting it incorporate into the dough before adding more. When all the flour has been added, the dough should be very soft, but still clear the sides of the bowl. If necessary, add a few more tablespoons of flour. Continue to knead the dough for about 5 more minutes until it's smooth and elastic.

Carefully place the dough in a greased bowl, cover with plastic wrap, and let rise in a warm place until doubled, about 1 hour. Gently punch down the dough to release gases and knead a few more times by hand.

In the bowl of a stand mixer fitted with a paddle attachment, or in a large bowl with a handheld mixer, combine the butter, brown sugar, walnuts and cinnamon and mix until smooth. Mixture should be crumbly.

Divide the dough into 3 pieces. Working with each piece individually, place dough on a well-floured surface and roll into an approximate 12x6-inch rectangle. Sprinkle one third of the walnut mixture on top of the dough. Starting at one long end, tightly roll up the dough and carefully transfer to a sheet pan lined with parchment paper, seam side-down. Repeat with remaining 2 pieces of dough.

When you have finished rolling up all 3 pieces of stuffed dough, braid them together on the sheet pan, tucking the ends under. Cover with greased plastic wrap and let rise in a warm place until doubled again, about 30-45 minutes.

Bread is best the day it is baked, but will keep in an airtight container for a few days.