@AlbaWaterhouse For individual servings, you have to have your sim take a plate and then have them set it down and not eat it. Once you get the servings separated you can set them for sale. At least, it worked that way when Frank ran his deli before Dine Out came out. And I never used the restock feature either. Once he closed down at night he would just replace it with new items he made.
He sold all kinds of meals and not just baked goods. He sold whole turkey dinners and lobster and things. Made good money!
https://i.imgur.com/Dofnttt.png