1. Prepare the Dough

1. In a large mixing bowl, combine 2 cups of flour, yeast, sugar, salt, and cinnamon.
2. In a separate bowl, mix the warm milk, melted butter, and egg until well combined.
3. Gradually add the wet ingredients to the dry ingredients, stirring until a dough begins to form.
4. Add additional flour, a little at a time, until the dough is soft and slightly sticky but not too wet.

2. Knead the Dough

1. Transfer the dough to a floured surface and knead for about 5-7 minutes until smooth and elastic.
2. Place the dough in a greased bowl, cover it with a clean kitchen towel, and let it rise in a warm place until it doubles in size, about 1 hour.

3. Make the Apple Cinnamon Filling

1. In a medium bowl, combine the diced apples, brown sugar, cinnamon, lemon juice, and flour. Toss until the apples are well coated. Set aside.

4. Assemble the Bread

1. Once the dough has risen, punch it down to release the air.
2. On a floured surface, roll the dough into a rectangle about 1/4 inch thick.
3. Spread the apple filling evenly over the dough, leaving a small border around the edges.
4. Starting from one long side, roll the dough tightly into a log.
5. Pinch the seams to seal and place the log seam-side down.

5. Shape the Bread

1. Gently twist the log a few times to create a swirl effect.
2. Place the twisted log into a greased 9×5 inch loaf pan.
3. Cover the pan with a towel and let it rise again for about 30-45 minutes, until it has puffed up.

6. Bake the Bread

1. Preheat your oven to 350°F (175°C).
2. Bake the bread for 30-35 minutes, or until golden brown and sounds hollow when tapped.
3. If the top browns too quickly, cover it loosely with aluminum foil during the last few minutes of baking.

7. Cool and Glaze (Optional)

1. Remove the bread from the oven and let it cool in the pan for about 10 minutes.
2. Transfer the bread to a wire rack to cool completely.
3. For the glaze, whisk together the powdered sugar, milk, and vanilla extract until smooth. Drizzle over the cooled bread before slicing.