Combine the ingredients to form the dough. In a large mixing bowl, whisk together the flour, remaining sugar, and salt. Make a well in the center of the dry mixture and pour in the frothy yeast mixture, eggs, egg yolks, vanilla extract, and orange zest.
Mix until the ingredients come together into a sticky dough. Gradually add softened butter, one tablespoon at a time, ensuring each addition is fully incorporated. Knead the dough for about ten minutes, either by hand or using a stand mixer with a dough hook attachment, until it becomes smooth and elastic. Avoid adding too much flour, as this can make the bread dense. Cover the dough with a clean kitchen towel and let it rise in a warm spot for one to two hours, or until it has doubled in size.
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