I thought I'd pop up a few photos and my review of the process and taste in case you want to know a bit before you go and buy your own.
This is my 3rd satchel. I've made it pretty much to spec/
Step 1: Empty pack into mug. Use a decent size mug but it doesn't need to be huge. Just bigger than a teacup.
Step 2: Add 40mL of milk. (Two tablespoons). And stir.
Step 3: pop it into the microwave
Step 4: Put in microwave for 1 minute. I put in a little bit more thinking I could use the convection part of the oven (grill in this case) to give it a bit more of an oven feel). But found that I had to buzz it for another 30 seconds to make it work because I did that. So just stick to the instructions and do 60 seconds :)
Step 5: Inspect (the usual stick a spoon in it to see if it's cake like) and buzz for longer if needed
Step 6: Sorry I had to rebuzz (30 seconds)
Step 7: it worked so it's eating time.
So for the taste it's good. And it's moist enough. It's a bit on the sweet side for me but then most things are! But not overly so. It just has a non baked and plasticiness about it. But I think that's the microwave part (hence my trial of using the grill above!). I have made this before by popping it in the oven and even added a crumble top and it was amazing! So it definitely can taste great.
It does in a pinch if you are craving something in the office that's quick and you can whip up. A cold wintery office day it would be perfect!
P.S. Here's a pic of the back of the box in case you want to see some details about it.