In a large mixing bowl, combine flour, sugar, and instant yeast. In another bowl, whisk together warm milk, poi, egg, and softened butter. Mix until just combined.

Attach a dough hook and gradually add the flour mixture to the wet ingredients. Knead on medium speed for about 10 minutes until smooth and elastic.

Turn dough out onto a floured surface and divide into 15 equal pieces. Shape each into a ball and place in a greased baking dish.

Cover with a towel and place in a warm area to rise until doubled in size, about 1 to 2 hours.

Preheat oven to 325°F (163°C). Brush the tops with whisked egg and bake for 20-25 minutes until lightly browned.

Remove from oven and let cool slightly in the dish before serving.