Combine the flour, softened butter, and salt to form a shortcrust dough. You may also add 2-3 tablespoons of salt. Let the dough rest in the refrigerator. Meanwhile, mix the eggs, sour cream, and flour. Season with salt, black pepper, and basil. Finally, stir in the grated cheese. Evenly spread the rested dough into a greased baking dish. Add the filling and finally arrange the florets of pre-cooked broccoli. Bake at 180°C for approximately 45 minutes.