In a large mixing bowl, combine the flour, sugar, and salt. Cut in the cold butter until the mixture resembles coarse crumbs.

In a separate bowl, combine warm milk with the active dry yeast. Let it sit for about 5-10 minutes until bubbly.

Mix the yeast mixture with the flour mixture and add in the egg. Stir until a cohesive dough forms.

Cover the dough with plastic wrap and refrigerate for at least 1 hour. Preheat your oven to 350°F (175°C) during the last 10 minutes.

On a floured surface, roll the chilled dough into a rectangle about 12 inches by 18 inches. Spread the apple pie filling evenly, sprinkle with cinnamon, fold over, and seal edges.

Place the shaped kringle on a baking sheet lined with parchment paper. Brush the top with an egg wash and bake for 25 minutes.

Allow the kringle to cool for about 10 minutes. Whisk together powdered sugar, vanilla extract, and milk or water until smooth. Drizzle over the warm kringle.