6 Tbsp (90 ml) water
5 oz buttermilk (150 ml) (at room temperature)
1 egg, beaten (at room temperature)
2 oz (57 g) butter, melted
16 oz (454 g) all-purpose or bread flour (please use a scale)
2 oz (57 g) sugar
1 tsp salt
1 1/2 tsp (5 g) regular or quick-rise yeast (one and a 1/2 teaspoons)
oil for frying (I use sunflower or grapeseed or a combination)
(sugar for coating the doughnuts)
(jam, chocolate hazelnut spread, and or whipped cream for filling, if desired)

Instructions
FOR BREAD MACHINE:

Place the water, buttermilk, beaten egg and melted butter in the bread machine pan, then add the dry ingredients which were weighed using a scale (it’s so important), except for the yeast. Make a small indentation in the dry ingredients, then add the yeast. Set the bread machine on the ‘dough’ setting.
FOR STAND MIXER WITH DOUGH HOOK, OR BY HAND:

Place the dry ingredients in a bowl. Put 6 Tbsp of lukewarm water in a cup and sprinkle the yeast on top, set aside for about 5 minutes, until the yeast begins to react (you can add a pinch of sugar to help it). Make a well in the center of the dry ingredients, then pour in the buttermilk, egg, melted butter, and yeast mixture. If using a stand mixer, run with the dough hook until a dough forms then continue for about 5 minutes. By hand, knead for about 10 minutes. Cover and set aside until at least doubled in size (usually 1 to 2 hours, depending on the freshness of the yeast, temperature of the water and ambient temperature).
BOTH BREAD MACHINE, STAND MIXER/HAND INSTRUCTIONS FOLLOW BELOW: