3D Printing is great for R&D, as one can easily and quickly change designs. For mass production......not so much.
For this specific application, mass production will almost undoubtedly be done by something like heated roller embossing of a roll-fed polymer sheet (think of printing a newspaper)
Here's a bet: first or second generation *printed food products* will be comprised largely of a material that's inexpensive, handles well as a dry/powder substance, and mixes with water.