Mix everything, including the roux but excluding the butter into a bowl and knead using a machine or by hand until elastic, or about 6 minutes, midway, add the butter. On the thermomix, it is a total of 7.5 minutes on knead mode.
You can prove this twice. First proof: leave it in a 40C oven to proof until double. It took me an hour. The dough is ready when it leaves a dent that does not retract when a finger is pierced through it.
If proofing once, then the above step can be skipped, go straight to shaping the dough.
Shape and then second proof again until double. It took me 45 minutes. This proofing time changes everyday even in the same kitchen as the conditions can be very different.
Bake at 200C in a fan-forced oven for 9 minutes for small buns, and for loaves, it takes another 30 minutes to proof and 25 minutes to bake,.
Enjoy them!