This post was inspired by this post.

If we grow algae in a plastic bag directly under the sunlight and genetically modify these algae to be non-toxic (or at least contain only toxins that can be deactivated by cooking) and produce gluten, we could grind them to powder and use that to bake bread.

this could be useful for a future mars settlement, where conventional greenhouses would be expensive because they would have to be completely air-tight, but air-tight plastic bags might be cheap.

I used AI (gulp) to generate an image of this:

I hope you all won't decapitate me for using AI to generate an image.

Btw here's a list of typical algae's nutrient content:

Source is Wikipedia. Spirulina are a type of algae that is a potential food candidate for spaceflight missions and mars settlement. You can find more using your favorite search engine using the keyword "spirulina".