Dissolve sugar in warm water, then add yeast and allow to activate.
Add measure for measure gluten free flour and potato flour to the bowl of your stand mixer then add salt.
Mix in 1/4 cup of butter using your paddle attachment until a crumbly texture forms.
Next, add eggs and milk to fermented yeast and mix together well.
Turn mixer on lowest speed, then pour in yeast, milk and eggs mixture.
Continue to mix until all of the dry and wet ingredients combine to form a soft dough
Remove from mixing bowl and place in a greased bowl.
Cover and let rise for 45 minutes to an hour
After dough has risen, divide into 3 equal pieces and form into 1 foot to 1.5 feet logs.
Braid logs together to form a plaited loaf.
Place loaf on a greased baking sheet, cover and let rise for another 45 minutes to 1 hour.
Preheat oven to 350°F.
Bake plaited loaf for 25-30 minutes.
Remove from the oven and brush with 1 tablespoon of butter.
Serve warm.