01 - Combine warm milk and yeast in a large bowl. Let stand for 5 minutes until foamy.
02 - Add sugar, melted butter, egg, and salt to the yeast mixture. Mix well. Gradually add flour, mixing until a soft dough forms.
03 - Knead dough on a lightly floured surface for 5–7 minutes until smooth and elastic.
04 - Place dough in a greased bowl, cover, and let rise in a warm place for 1 hour, or until doubled in size.
05 - In a small bowl, combine brown sugar and cinnamon for the filling.
06 - Roll dough into a 12x16-inch rectangle. Spread softened butter over the surface, then evenly sprinkle cinnamon-sugar mixture. Fold the dough in half lengthwise and cut into 12 strips.
07 - Twist each strip several times, then place on a parchment-lined baking sheet.
08 - Cover and let rise for 15 minutes while preheating oven to 375°F.
09 - Bake for 18–20 minutes, until golden brown. Cool slightly.
10 - Whisk together powdered sugar, milk, and vanilla extract. Drizzle over warm twists before serving.