A quick note before beginning - The times shown in the recipe are just a guideline. The overall fermentation times will vary depending on your environment, including temperature, humidity, and yeast activity.
Combine soymilk, sugar, invert sugar and yeast in a mixing bowl and stir for two minutes until fully dissolved. Add the flour and mix for 4-5 minutes on KitchenAid Speed 2 (KS2).
Cover the dough and allow it to rest for 30 minutes.
Add the salt and mix on KS2 for 9 minutes or until the dough reaches 24 °C.
Add 1/4 of the butter cubes and mix until incorporated on KS2 for approximately 10 minutes (this may take longer depending on the flour strength).
Add another 1/4 of the butter cubes and mix until incorporated (KS2).
Add the remaining butter cubes and mix until the dough reaches 24 °C (KS2).
S&F 1: Transfer the dough onto a working surface and perform 5-6 slap and folds until it develops a more defined structure. At this stage the dough will still be shaggy.
Cover and rest for 20 minutes.
S&F 2: Repeat the slap and fold process a few times to create tension and strengthen the dough’s structure. Avoid excessive folding as the surface should not tear apart.
Cover and rest for 20 minutes.
S&F 3: Perform a final slap and fold.
Place the dough in an airtight container and refrigerate overnight at 3-6 °C (starting around 18:30).