Prepare the sponge the same day as the final dough. Combine the flour, milk, and yeast and mix on low speed until homogeneous. Increase the speed to high and mix until the dough comes together, about 1 minute. Ferment for 30 minutes.
To prepare the final dough, combine the sponge, flour, malt syrup, eggs, salt, and about one-third of the butter. Mix on low spee