Transfer the yeast mixture to a large bowl, or the bowl of a stand mixer fitted with the paddle attachment, stir together the 300 grams bread flour, sugar, cardamom, and egg. If using a mixer, mix on low until the dough begins to come together. Mix in the salt. Add in the softened butter, a little at a time, waiting until the butter is fully mixed in to the dough before adding more to the bowl. Once the dough has come together (it will be very soft and sticky), sprinkle with the remaining 10 grams of flour and allow to rest for about two minutes.