Add 500g flour, active dry yeast and sugar to the bowl of a stand mixer and whisk to combine.
Fit the mixer with the dough hook attachment.
Add warm water and knead on medium low until the dough is smooth and pulls away from the sides of the bowl (about 5 minutes).
Add softened butter and salt and knead on medium until the butter is incorporated.
Add 50g flour and knead until dough is completely smooth and elastic. (About 7 min). If the dough is still sticky, add remaining 50g flour.
Knead dough by hand a couple of times and shape into a ball.
Place into a greased bowl, cover and let rise for 45-60 minutes, until doubled in size.
Grease two 22×12 cm (9×5") loaf pans.
Stir the granulated sugar and cinnamon together in a small bowl.
Deflate dough on a clean surface and roll into a rectangle, about 44 cm (18") on the short side and 1/2 cm (1/4 ") thick.
Spread with a thin layer of apple butter, and top with the cinnamon sugar.
Starting at the short side, roll into a tight log (like a cinnamon roll).
Cut the roll in two, cross sectional, to get two logs.
Using a sharp knife, cut the log in half lengthwise, leaving the two halves attached at one end. Twist the two long pieces together and place in the prepared pan. Repeat with the other log.
Place into the pans. Cover loosely with plastic wrap, and let rise in warm place until doubled in size (30 -45 minutes).
Preheat the oven to 175C (350°F.)
Bake for 40 to 45 minutes.Cool completely before slicing. Enjoy!