Panaderia Artesanal Miguita is my go-to when in exploring the Peninsula Valdes. Restaurants are great but nothing beats a picnic lunch with a view in Patagonia. Also, you never know when you'll be near a restaurant during your wanderings, and ALSO - Patagonia is expensive. Picnics win every time.

I've spent a lot of days on the peninsula and they always start with a run to Miguita to pick up supplies. I'm a huge fan of their Tortilla Española, which they sell whole. It is something that holds up great for lunch. They also have sandwiches, empanadas, pastries... you name it. If it's made out of flour, then you can get it here.