Usually it's a case of taking your Downloads folder out and trying again. If you get in then the problem is in your Downloads folder. I suspect you know that though as you've run CI. Have you tried the Hack Conflict Detection Utility from
Sim's Wardrobe? Find it by going to Sims2>Programmes. Not all conflicts are a problem but it is a good starting point. Do you have any hacks related to that stove/restaurants/the NPC chef? I think that'd be my first thought. After removing them and trying your game, asssuming it still doesn't work, I'd take out all my hacks and try again. If that didn't work then the whole Downloads folder would come out and I'd add batches at a time until I found the right batch. I'd probably start with custom stoves. How I wish there was a magic wand to find problem files but there's no easy way, except to get into the habit of keeping your cc reasonably well organised so that future rogues are easier to find.