01 -
Combine flour, sourdough starter, sugar, and salt in a bowl. Incorporate cold butter until mixture resembles coarse crumbs. Add cold water gradually until dough forms. Knead briefly for smoothness. Wrap and chill for at least 30 minutes.
02 -
Roll chilled dough to 1/8-inch thickness on a floured surface. Cut into squares. Place jam on half of each square, fold over, and seal edges firmly with a fork.
03 -
Preheat oven to 400°F (200°C). Place pop tarts on parchment-lined sheet. Optional: brush tops with beaten egg for golden finish. Bake for 10-12 minutes until puffed and golden.
04 -
Whisk powdered sugar and milk until smooth and pourable.
05 -
After cooling, drizzle glaze over pop tarts. Allow glaze to set before serving.