I don't usually have leftover marinara sauce but if you do, you can add a couple spoons full over the top of your chicken before adding the cheeses and breadcrumbs to make an easy parmesan chicken. You can pretty much do whatever you want with this recipe and it turns out great. If you end up with a burn at the end, just cancel the saute and press keep warm. To clean up the instant pot easily after removing all the pesto pasta, add water, lid, seal, and pressure cook for 5 or 10 minutes. After a natural release the pot should be pretty easy to clean.