The only reason it would be dry and not gooey is if it's overcooked so you can either just reduce the time further. Start checking at 8 minutes. If it's set well around the edges with a bit of a crust in the middle but you can feel it's liquidy inside, then take it out.
If it's too underdone at 8 minutes keep it going but check again every minute or so.
OR, reduce the temperature. Try 350 °F. I'd still start checking after 10 minutes though just in case.
Underdone is better than overdone and they continue cooking a bit when out of the oven anyway.
Once you've got it right once you'll know for future occasions.
Oh and highly recommend getting an oven thermometer. They are pretty cheap and it will allow you to know the temperature is correct for whatever recipe you're making.
Good luck!

I'm so pleased you enjoyed it Cathy! And it's awesome it ends up being quite diabetic-friendly too!

No worries! Hope you enjoy them!

sorry, obviously can't read. thinking of trying these on monday for my birthday :)

It says in the post and the recipe the size of the ones I used. It's 175mls (6 oz or ¾ cup). You would be able to make it in smaller ones, you'd just have to reduce the cooking time so it might be a little hit and miss the first time you make them.