Step 1

Place yeast, 1/4 tsp sugar and warm water in a small bowl to proof.

Step 2

Add bread flour, mashed potatoes, sugar, salt, oil and 1 egg in the bowl of a stand mixer. Using the paddle attachment, mix for 10-20 seconds.

Step 3

Add yeast-water mixture and change to dough hook. Mix on medium speed for 8-10 minutes, until dough is shiny, smooth and bounces back.

Step 4

Place dough in lightly greased bowl with plastic wrap over the top. Allow to rise for 1 1/2 - 2 hours.

Step 5

Remove dough and divide into 16 even pieces. Roll each piece into a rope around 2 1/2 inches long and 1/2 inch wide. Place on a baking sheet lined with a silicone baking mat and cover again with plastic wrap. Allow to rise another 1 1/2 - 2 hours.

Step 6

Preheat oven to 350 degrees. Brush each  bun with beaten egg. Top with poppy seeds if desired.

Step 7

Bake for 18-20 minutes, until tops are just golden.

Step 8

Allow to cool, and slice down the middle.