just made this for lunch. I put the breadcrumbs on top so had reduced the cooking time to 20min. I checked at 10min and it was looking GOOD!! and came back at 19min and in my opinion it was a little overcooked. The bite-sized vegetable pieces were no longer nicely together-looking and it had started to mush up a bit. So i imagine at the suggested cooking time of 30min it would be well and truely too mooshy.
But quantities are good, and the flavour lovely.
I'm going to do it again but keep an eye on it from about 12min onwards. Either that or reduced the cooking temp.
I made the topping in the TMX too with two slices of frozen seeded bread, a couple of chunks of parmasen cheese grated together. Then i added some fresh chopped basil and parsely. Sprinkled it all over the ratatouille, then dotted it with a few small bits of butter.