Preheat oven to 350F/180C. Lightly grease a cookie sheet.
In a mixing bowl, add flour, salt, butter at room temperature, shredded cheese, sour cream, and black caraway seeds.
Mix well until all the ingredients come together as a dough.
Cut the dough into three parts.
On a floured surface, roll out the dough to ¼ inch or 5 mm thick. Brush the surface with egg and cut straws with a pizza or a pasta cutter, about 3x½ inch or 7.5x1cm strips. Place them on the prepared baking sheet.
Bake them at 350F/180C for about 20 minutes until nice and golden.