In a mixing bowl, combine 1 cup of flour, granulated sugar, salt, and active dry yeast.

Gradually mix in warm milk and eggs until well combined.

Add the remaining flour and knead the dough with your hands for about 5-7 minutes, until smooth and elastic.

Gently incorporate the softened butter into the dough and continue kneading until fully integrated.

Place your dough in a greased bowl, cover it with a clean cloth, and let it rise in a warm place for about 1 hour, or until doubled in size.

In a bowl, combine the brown sugar and ground cinnamon. Mix well.

Toss the diced apples lightly in this mixture for an evenly distributed flavor.

Roll out the risen dough on a floured surface into a rectangle (approximately 12x18 inches).

Spread the apple mixture evenly over the dough, leaving about an inch around the edges.

Starting from one long side, roll the dough tightly into a log.

With a sharp knife, slice the log in half lengthwise to reveal the filling.

Twist the two halves together, and place in a greased loaf pan, tucking the ends underneath.

Cover the loaf pan and let it rise again for 30 minutes while you preheat your oven to 350°F (175°C).

Bake the babka for 30-35 minutes or until golden brown.

A wooden skewer inserted in the center should come out clean.

Allow it to cool slightly before slicing. Drizzle with icing if desired!