What is the best meal prep for a diabetic with PCOS?

I'm looking for a meal prep strategy that takes into account PCOS. I've noticed that if I am snacking too frequently (eating 6 small meal per day), my insulin resistance gets worse. Is there a meal prep plan (or a diet) that has worked for you, or someone you know? I'm currently doing keto, and I don't need a drastic diet change, but I am looking for a meal prep plan that engages insulin sensitivity.