Direct use of solar heat is a simple cooking option, though somewhat inconvenient.

I'd like to see a solar oven based on a thermal transfer medium which heats a cooking void indirectly --- steam or other working fluid.

Advantages would be that the cooking itself would be more conventional, within an oven (possibly resembling a thermal-mass wood-burning stove, and ideally, usable with fuel for instances in which sunlight was insufficient). Several cooking / heating chambers and/or surfaces could be arranged for different heating needs.

And because of the thermal mass, the at least over the course of the day, cooking and baking would be reasonably insensitive to at least short-term interruptions of clouds or other weather.

You might have to get used to cold breakfasts however.

I find few references for anything resembling this design, far more common are solar "box cookers", typically achieving temperatures of ~150-160 C (~300-325 F).

This somewhat resembles the concept: https://www.webplaces.org/solaroven/design.htm